Deep Dive
Shownotes Transcript
Banking with Capital One helps you keep more money in your wallet with no fees or minimums on checking accounts and no overdraft fees. Just ask the Capital One bank guy. It's pretty much all he talks about.
If you're one of over 2 million adults in the U.S. suffering from plaque psoriasis, the itchy, scaly patches of this chronic skin condition may make you want to put your life on hold.
Welcome to Stuff You Should Know, a production of iHeartRadio. ♪♪♪
Hey, and welcome to the podcast. I'm Josh, and there's Chuck. And this is Stuff You Should Know. It's just Josh and Chuck today. That's all right. Don't freak out, Chuck. We're going to make it just fine. I'm just glad we're recording. This is just a little inside baseball here. This is our third attempt at this recording sesh.
Yeah, well, you diffused my inside joke to you that I didn't have enough time to prepare for this episode. Yeah, my internet went out because of a windstorm last week.
And then we were like, you were kind enough to be like, we'll just do it next Thursday. And then yesterday, your internet had problems. And I said, well, let's just do it tomorrow morning because, you know, Friday morning at 855 is when the voice is in perfect shape. Right. Which was also very kind of you. So we've been kind to one another throughout this ordeal, at least. You got to do that, people, if you want to stay married. Yeah, definitely. You want the other person to hold your hand, you better be kind. Yeah.
But I'm excited to finally – and, you know, probably – it was probably good that I had a lot more time with this because this is one of those –
Yeah, for sure. So what we're talking about today, Chuck, is the Silurian hypothesis, which if I could do anything with this thing, I would rename it. I'd be like, guys, that was a terrible decision. Yeah. Like, keep listening, everybody. Yeah.
So right. I promise it's interesting. So the whole thing came out of we'll explain in a second, but we should probably talk about where it came from and why we don't like this name. The whole thing came out of a meeting between a guy named Adam Frank, who's an astrophysicist at the University of Rochester, and a guy named Gavin Schmidt, who's the bigwig director for the Goddard Institute for Space Studies, a NASA joint. Yeah.
And Adam Frank went to Gavin Schmidt and said, hey, I'm trying to figure out if we could find ancient defunct civilizations elsewhere in, you know, off of Earth.
What would I look for? And the reason he was doing this, it's an answer to the Fermi paradox. Where is everybody? Well, one answer is, well, they were here, but now they all died out. So Adam Frank is looking for evidence that they were there. And Gavin Schmidt said, let me just stop you right there and up the ante here. Well, actually, you know what Gavin Schmidt said? What? He said, let me tell you something, Professor Frank. Hey. And Professor Frank said, what?
Oh, God. If I had a dime for every time somebody did that. Right. So, so close. Yeah, Schmidt was like, hey, buddy, what'd you say? I'll one-up you? I'll up the ante. Okay, I'll up the ante here. What if it's planet Earth? And what if there were ancient civilizations here, my friend? Yeah. And they said, check, please.
Yeah, Adam Frank just vomited directly all over Gavin Schmidt's desk very famously. Yeah, I mean, I think they sort of started chatting about this thing. And we should point out that, you know, what we're going to – they wrote a paper. We'll get to that in a second. And they named it Salarian Hypothesis. But neither one of them think like, oh, I think this is what happened. Right. It's more, you know, it's a thought experiment. It's what happens when two remarkably intelligent people get together sometimes and take LSD. Right.
One of the other things about it that I think makes it worthwhile, too. First of all, these guys were the first scientists to seriously explore the idea, which you can apply science to anything like that. And even though they don't think that it's correct, they don't rule it out. You can't rule it out. There's not enough information to rule it out, right? Yeah. But the other thing that it does is it provides kind of like a guide to
To see what we're doing now, what signals we're going to leave in the far future as well. Yeah, absolutely. So I imagine they went to another venue. They went to a bar afterward to have a drink. Yeah. Keep this party going. And they were like, well, you know, there's been enough time for something like this to have happened. Yeah. Because when you look at the fossil record, the oldest thing that we know of is a cyanobacteria fossil that.
That's about three and a half billion years old. That was from the ocean. Yeah. And if you're talking about complex life, then you only have to go back about 540 million years ago to the Cambrian explosion. So like anything beyond that was, you know, stuff like cyanobacteria that we know of at least. So any prior intelligent species wouldn't theoretically be older than that Cambrian explosion.
Yeah. They call it an explosion because everything went from single-celled organisms, like you were saying, to basically all the types of animals on the planet today. Yeah. It exploded. It's just the best name for it. You really can't add to that. But there's another guy, another character we need to add here, and his name is Jason Wright. I like this guy. He's an astronomer at Penn State.
And he said, whoa, whoa, guys. And this is in a separate paper that I think even predated the Silurian hypothesis paper. He was sitting next to them overhearing them at the bar. Right. They were like covering their work while they were. Exactly. So Jason Wright says not to them directly, but in general, he's like, OK, we don't know that you have to stop at the Cambrian explosion to to look for intelligent life on Earth in the past.
And the reason why is because we have a really like that's using a really limited definition of life. That's using the kind of life that has certain body plans with a central nervous system. Some have like backbones. Some don't. Some are jellyfish. Doesn't matter.
Like, what if there's other kinds of life out there? What if some of those single-celled organisms had gotten together and formed like a hive mind colony that was capable of intelligent industrialization? We wouldn't know that. Like, think out of the box, guys. Yeah, exactly. Because, you know, it's hard to wrap your head around
All we know is us and what happened with the development of how we got to now. Yeah. So he's like, you know, turn that off, everybody, because that could have happened. What Josh Clark just said. And they were like, who's Josh Clark? And they said, oh, you'll find out soon enough. He said, or maybe there was another like Cambrian like explosion that happened like way, way back before that.
And maybe it's maybe they didn't leave any fossils behind or so few that we didn't find them. Or maybe, you know, there was a cataclysm that destroyed everything like there was this complex life. It destroyed everything. And it kind of just rebooted the system with these single celled organisms. And that's what we know is the start. Right. Right.
Yeah. And they went, whoa, buddy. I know. It's pretty cool. Can I pay for this guy's drink? Yeah. Can I buy you a beer? So Gavin Schmidt and Adam Frank are like, we think we're on to something here. Let's kind of flesh this out a little more. And I think it was Gavin Schmidt who suggested they call it the Silurian hypothesis. Yeah.
And the reason they call it the Silurian, that's, I think, a period or an epoch or something in Earth's history, 500-something million years ago. But they weren't naming it after that. They were naming it after a race of lizard people who are characters on Doctor Who. Yeah. Do you have any Doctor Who experience?
None. I feel like it's like this whole thing out there that's just waiting for me to meet it. And I'm like, I don't know. I mean, I've never I don't know anything about it, but I just caveat that because there may be emails coming in that are like they're not lizard like people. They are this like I have no idea. I looked at pictures of them like you did, and they look like lizard reptilian type creatures.
They do. So, I mean, for all intents and purposes, if you're not super into Doctor Who, they're lizard people. I really, really hope so. The reason that they named it after this race of lizard people in Doctor Who is that in the Doctor Who universe, they lived about 300 million years ago, which would actually place them in the Carboniferous period, not the Silurian. And apparently all Doctor Who fans are aware of that. Right.
Because they're all Dr. Franks. Right. But they supposedly survived a bunch of cataclysms here on Earth by moving underground and hibernating until things cooled off a little bit. And now they're back in the Doctor Who universe. So they would be like the ancient civilization. And so there's two reasons why I find that unfortunate that they named it after that. One, it just makes the whole thing silly.
to a degree. Apologies to Doctor Who fans, but it, like, this is an actual, like, academic exercise they're engaged in and it has a silly thing out of the gate. It's a, I mean,
Again, we're not saying Doctor Who is silly, but it'd be like us coming up with like the family ties hypothesis or something. Right, right. Like it's named after a TV show. It says like before you even read the abstract, don't take this seriously. Yeah. But it's meant to be taken seriously. It's not tongue in cheek at all. Yeah. The paper isn't at least or the hypothesis. The other reason why is because every single article.
author who wrote any piece or article about this hypothesis afterward uses a hypothetical lizard race to discuss what we would be looking for. And it's so obnoxious, man. So we are not going to do that. No, no. We're not even going to try to guess what they would be like or look like. They're just the hypothetical ancient industrialized civilization that we're looking for. So if we're looking for something like that here on Earth, Chuck, we're
What would we start to look for? Well, and I mean, those are sort of the questions these guys started. I guess they went to another bar and started asking. They're pretty sloshed at this point. And they start asking even more questions, I guess, after they got over the the I mean, hopefully they didn't have to argue about Salarian. I'm praying they were both Doctor Who fans and that Dr. Frank didn't have to convince old Gavin.
I think it might have been the other way around. And based on the titles, I think Frank would have had to go along with it. Okay. Well, either way, they started to sort of ask these big questions. And what it really comes down to are...
two main questions. What should we be looking for? And in order to think about what should we be looking for, a good place to start is, well, what are we leaving behind that a future archaeologist or geologist might look for? And when they started poking around a little bit, they found that, you know, there's some stuff here that does bear a resemblance to like possible signals that something could have happened.
as far as an ancient industrialized civilization that just went away. Like you can't hear it, but my jaw just dropped. All right. Josh's jaw is on the floor. We're going to seek some medical attention and we'll take a little break and we'll be right back. We should now.
Hey, everybody. Summer is the best time to run the way you want to. You can dial it up with new challenges and programs. You can bring your workouts with you to make the most of those beautiful outside sunny days. That's right, because summer is the best time to push your pace, move how you want, enhance your fitness journey, and feel like your most empowered self. And of course, we're talking about Peloton. That's right. Whether you're prepping for a marathon or improving your pace, whatever road lies ahead, your training starts here with Peloton Tread or Tread Plus. That's right.
That's right. I love Peloton. And the thing I love most are their great slate of instructors. They can take you to new heights. They can tap you into their expertly programmed workouts and real-time metrics, which is also great, like pace targets. They can take your fitness journey to new heights. That's right. And Peloton's classes challenge you to be your best, no matter what your experience level. So call yourself a runner with Peloton at onepeloton.com slash running. That's O-N-E-P-E-L-O-T-O-N dot com slash running. ♪
Hey there, it's Ryan Seacrest for Safeway. It's back to deals time. Now through August 13th, enjoy store-wide deals and earn four times rewards points. Look for in-store tags for eligible items from all free and clear detergent for a healthy routine. Then clip the offer in the app for automatic event-long savings. Enjoy savings when you shop in-store or online for easy drive-up-and-go, pickup, or delivery. Restrictions apply. See website for full terms and conditions.
Visit Safeway.com for more details. Amazon Pharmacy presents Painful Thoughts. Oh, I'm sick. So I took my sick to the doctor. The doctor gave my sick a prescription. Now my sick and I are in line at the pharmacy mingling with all the other sicks on its way to becoming an even worse sick.
Next time, keep your sick at home and let Amazon Pharmacy deliver your meds right to your door. Amazon Pharmacy. Healthcare just got less painful.
Stuxnet. Stuxnet. Stuxnet. I don't know what that is. You know what Stuxnet is. Is that in this? Stuxnet. Stuxnet. It's a great name. Yeah, it's Stuxnet. That's the name of it. I know. It's a great name. All right. Stuxnet with an X. All right. So we're back and we were talking about where you might or what you might look for if you're looking for a previous advanced civilization. And sort of the obvious first place, you know, we're going to start easy and get a little more complex here.
It's just like all the physical stuff. Like if you're an industrialized intelligent civilization, you're going to have industry and cities and factories and things and skyscrapers and buildings. And it's hard to wrap your head around all that stuff being gone one day when you're living amongst it. But like the life of a skyscraper is about 50 years without human intervention.
to, you know, start, you know, that's why when you go to New York, every building has scaffolding on it practically because you have to keep those buildings up. They start falling apart because of corrosion and erosion. So without that,
Even though it's hard to imagine, everything will eventually be gone. And we're talking about in the grand scheme of the big, big timeline. So like hundreds of millions of years. Yeah, yeah. But for a city itself, I mean, apparently water intrusion is a big problem for all of those tall buildings, as well as erosion and corrosion and all that stuff.
It's not going to take millions of years for them to go away. We're talking thousands to tens of thousands of years. And our cities will be just completely rubble, especially ones that are built on solid ground or rocky ground, well above sea level, because those...
Those are the ones that are most like open and left vulnerable to the processes of erosion that sweep across Earth's surface and wipe the whole thing clean. And yeah, it wouldn't take very long. The stuff that's underground might be a little more easily preserved. Like there, you know, any under any city, there's a huge network of infrastructure, pipes and cables and tunnels and hard hats and stuff like that.
That that conceivably, even after the city above is long gone, that stuff could could be preserved to a certain degree. Yeah, for sure. And we should shout out this guy that did you dig him up or was that Livia? I think Livia found him. Yeah. His name is starts with a J, but it's Jan Zelisiewicz. And he's a paleontologist at the University of Leicester.
Mm-hmm. Nice work. Oh, boy. In the UK. And we shout him out because he sort of led us down this path of looking underground, potentially looking underwater, because things would just deteriorate a lot slower down there. But he's just a guy I just want to recommend if you want to get into some heady sort of
YouTube stuff. Just Google Jan Zelisiewicz. It's Z-A-L-A-S-I-E-V-I-C-Z. Because I went down a little, because we had so much extra time. Just a little bit of a rabbit hole. Watching this guy, he has a bunch of YouTubes where he's speaking to university groups and classrooms and things. And he's just super smart and interesting. Yeah. The stuff he's into is super cool too. But yeah, he himself gets it across really well. Oh,
I like that guy. Yeah. So he points out, he was the one, I think he chose San Francisco. Like San Francisco is a goner. It's not going to be around very long. Once we're gone. And by the way, I keep saying once we're gone. Remember that amazing 2007 book, The World Without Us by Alan Weissman? Never heard of it.
Oh, yes, you have. It was like all the thing back in 2007. They made like TV shows about it and all that. So this guy basically went to the trouble of figuring out in five years, 10 years, 50 years, 100 years, 1000, so on. That sounds familiar. What the planet would be like after if humans just suddenly vanished.
And like he goes into detail of like the processes of erosion and corrosion, what effects it's going to have. It's just so fascinating. That's super cool. Yeah, it is super cool. And like the series, at least one series, I think on like Science Channel or something like that was worth watching, too.
But that's I mean, that has a lot to do with what we're talking about. So the topside city is gone. The stuff underneath might be preserved. But the cities that are built along water and there's a lot of cities that are built along water. They like, say, New Orleans is actually built below sea level. When people are gone from New Orleans, New Orleans is going to go away really quick.
But it will probably get preserved or at least covered over, if not preserved, by a lot of the muck, the Delta muck that's brought down the Mississippi River. And that will conceivably create the conditions to preserve the whole city in some form or fashion. Totally. But, and, you know, a lot of the thought experiment is like introducing things and poking holes in it.
There's not a lot like, you know, if you live in an urban area, it's kind of hard to think that there's not much urban area in the world, but there really isn't. I think the the liberal estimates have it at about a little less than three percent, like two point seven, two point eight percent of the world has been urbanized. Some people put it as low as one percent. So there's there's a lot of just land out there still.
So if you're looking for an ancient civilization, I mean, who's not to say that it could have been like 50% of the earth, but chances are it would be something a little more like what we're doing.
For sure. And so, like you were saying, like, that's one of the cool things about this as a thought experiment. Like you raise this point and then you like poke holes in it. Then sometimes you can kind of support it instead. And so like a legitimate question would be like, why are we assuming that an ancient civilization from millions of years ago in Earth's history had cities?
And the reason why, if they have any kind of intelligence, typically the more of an intelligent organism you put together, the more advanced it becomes. Like 12,000 years ago, there was something like 15 million people across all of planet Earth tops. But then as we started to grow in density,
thanks to like agriculture and animal domestication, all of a sudden our technology started to develop at a really rapid pace, geologically speaking. And now here we are. So we could assume that there'd be some form of density because you need X number of intelligent organisms to advance to an industrialized civilization, one would imagine. So there's actually a legitimate reason to think that they would have cities that we could look for. The problem is this, Chuck, and you know this as well as I do. We'll see.
The earth does not like things like cities and ruins or fossils. Let's talk about fossils.
Yeah. I mean, that seems to be the next best place to start looking if, let's say, the buildings are gone. Fossils are how we know what happened in our distant past. But fossils are tough just because of how rare they are and how hard it is to make one and how sort of lucky it is that they happen to begin with and that we find them. The T-Rex is a great example of
Just a little like back in the envelope math, some estimates say that somewhere in the neighborhood of 20,000 T-Rexes at any given time during their run were walking, stomping around planet Earth with their tiny little baby arms.
They were around for about two and a half million years. That comes out to roughly 127,000 generations on the lifespan of a T-Rex. So we're talking total, roughly, of course, about two and a half billion individual T-Rexes that lived and died at any point in their history. And we only found 50 fossilized skeletons, which is a lot.
which is about two millionths of 1% of the total population. Yeah. I should forewarn you that two millionths of 1% is my math personally, but I did use an online percentage calculator like three different times to make sure. So it's accurate, my friend. Oh, I know the math people are always checking you. I was about to say getting your back, but really trying to prove you wrong. No, they're not getting my back. I got a target on my back. That's what they're trying to get.
But, you know, the movie Jurassic Park, as silly as some of that stuff was with the great movie, don't get me wrong. But, you know, the mosquito being covered in amber, like if you if you look at that movie, like that one mosquito got trapped in amber. And that's kind of what we're talking about here is just sort of the dumb luck of the fossil happening to begin with a mosquito.
And then that fossil that's buried eventually getting pushed up to the Earth's surface where we can find it. Right. But within the window between it popping up and it being findable to it eroding to where it's not findable anymore. It's like it's all I mean, that's why we don't have, you know, billions and billions of fossils is because it's just really rare.
To make one and find one. Yeah, not just making one, but yes, finding one. It's all a product of time and space in a really complex formula. And I saw an article called How Can I Become a Fossil by John Pickrell from 2018 on BBC. Really well worth reading. Did it say start listening to the Doobie Brothers? Nice. Oh, yeah. R.I.P. Dickie Betts, huh? Well, the Allman Brothers, but sure.
Well, yeah, I know. I knew that. But yeah, okay. I mean, they're both brothers. Yeah, yeah. Same time period. RIP Dickie Betts. That was a tough one. If you had been in my brain, it would have been. No, I got you. Yeah, of course. And it's also 920.
So John Pickerel cited an estimate that one-tenth of 1% of all the species that have ever existed has had one of their individuals fossilized. Oh, wow. So just really tiny, tiny percentages of fossils are ever created. And also, I got to just say this quote, too. There's another article called Anthropocene is a Joke. Yeah, I thought you were going to skip this one. This is great. Yeah, a guy named Peter Brannon, who's a science writer, wrote it. And basically, he's...
explaining just how insignificant humans have been on Earth, even as much as we've affected Earth, just how insignificant it actually is and how easily Earth will shake our stuff off. Yeah. But he had this great quote. I think you should say it. Oh, okay. Do you know where he's from so I can prepare? No, let's say Austria. You jerk. Yeah.
I mean, I guess it's sort of German. I'm just going to read them as American. This is a great quote. Each fossil was its own miracle sampled randomly from almost 200 million years of history. A few stray windblown pages of a library. Isn't that great? Yeah. That really drives it home. It
It really does. So hats off to Peter Brannon and John Pickerel. Definitely go read those and also go watch YouTubes of Jan Zelisiewicz. Zelisiewicz, right? Zelisiewicz. Kind of like Manischewitz. Right. But with a Z. Yeah. So all of that said, though.
We have discovered really, really old fossils. The oldest hominid, our ancestor, the oldest indisputable ancestor to humans, Australopithecus anamensis, was walking around four and a half, almost four and a half million years ago. And we have a skeleton of that guy. So as miraculous as fossilization and discovery of fossils is, it does happen.
Yeah, absolutely. And that's hominids. Our old buddy Jan Zelosevic is like, you know what else could happen is we're creating a bunch of potential techno fossils as we advance. Like somebody could find a smartphone one day. Somebody could find a grocery bag that's been fossilized. Sure. The more likely thing that's going to be found is not some smartphone that you could plug in and then reboot. Yeah.
Right? They'd be like, let's see what pictures this guy has. But it might be something like a brick or a glass bottle that's, you know, that clearly human made, that's like artificial in shape. And it may be stamped with like a company name or something like that. Like something like that is more probable for a future archaeologist to find as a technofossil. Yeah. Yeah.
Or plastic, right? Plastic is another good one. We actually don't know how long it takes plastic to break down to its constituent parts. We know that it breaks down into really, really small particles, but they're still like microparticles of plastic. It's like intact particles of plastic, right? And if future...
like race discovered our plastic, they'd be like, this is really bizarre because by definition, the plastic we make is artificial. There are like polymers in nature, like cellulose that are an analog to our plastic, but all the plastic we make is not found in nature. So if they found that they'd be like, this is kind of weird. What's going on with this? Yeah, for sure. And then chicken bones too, Chuck.
Have you ever seen, it was an Instagram account, it may have been called Atlanta Chicken Bones, that were just these great pictures of chicken bones in parking lots and sidewalks all over Atlanta. Right. So that's a really great point. There's the people who are like all bully on the Anthropocene, the idea that the humans are creating our own geological era or epoch.
say like chicken bones are probably a pretty good bet for like fossilized evidence of our presence because we raise and kill so many chickens it boggles the mind their bones get everywhere and
They are anatomically different from all other kinds of chickens because we bred them to be different, like have huge breasts and not be able to walk and all sorts of terrible stuff. Yeah. So if you found other chicken bones in the fossil record and then you found our broiler chicken bones, you'd be like, what is this? And also, why are they in Antarctica? Right.
I also want to point out, since I brought up Atlanta chicken bones, I am a lover of fried chicken, as you know. Yeah. It's probably my favorite food. And I have been known to have car chicken. As long as there's no shower chicken. I'm still, it's still the wine and the sand that I'm keeping. No, you want to keep it crispy. You don't want any humidity in there. Right.
But I've always resisted the urge to toss my chicken bones because I have dogs and I walk dogs. And if you're not paying attention, that dog can snap up a chicken bone on the sidewalk pretty easily. So just a PSA there. Try and keep those chicken bones in the box. Yeah. And chicken bones can splinter so readily that it can really hurt your dog's throat, stomach. You don't want a dog eating chicken bones, okay? Yeah. Did I ever tell you this?
This will be quick about when my deceased dog Buckley ate an entire drumette that fell off the grill. No, it popped off many years ago. Buckley left us. But I looked down. I was like, oh, shoot, chicken bone or chicken drumette. And it was just gone. And it was gone so fast. And Buckley was there. But I was like, he wasn't chewing or anything. I was like, what happened to that thing? Ten minutes later.
Oh, no. He barfs up a hole. He swallowed it whole. A whole chicken drumette that was still steaming from the heat of the grill. Oh, God. So it was like, I mean, thank God he did that because that would not have been good. Yeah, he swallowed that thing like a pill. And then when he threw up, he wiped his mouth. He's like, totally worth it. Yeah, I think he thought it was worth it.
So I said something earlier, Chuck. We were talking about ruins, fossils, all that stuff. I said that Earth doesn't really like that kind of stuff. And I was right.
Are you setting me up? Yeah. Yeah, well, because here on Earth we have plate tectonics. We have a situation where if you're talking about the ocean crust, it subducts below the lighter continental crust and it's going to push everything down, down, down toward the mantle where it melts and then eventually comes back up
via like a land volcano, maybe an undersea volcano to form a new crust. And it's just like this giant, super, super slow recycling conveyor belt.
Yeah, it takes, I think, on average, about 250 million years for new crust to go through that whole cycle. And that's just on average. It can take hundreds of millions of years longer. Yeah. It can take less. But that's just kind of generally how slow it is. The point is, is that after X number of millions of years, that crust and everything attached to it is totally gone. Once it hits that mantle, it doesn't discriminate. Everything gets melted. Everything gets melted in the mantle. Yeah.
What about on land? Well, land is not subject to the forces of like subduction, right? But it does have that erosion through wind and water and everything just kind of gets recycled in its own way. Plus also, you
The plates that do collide with one another, and there's continental fault lines, obviously, too, that produce earthquakes. When they collide, the stuff anywhere near those edges gets all kinds of messed up. And that's how a lot of mountain ranges form. And then there's the Himalayas. The thing is, is that erosion, that process of erosion that completely recycles Earth's surface over X number of years,
In 88 million years, the Himalayas will be gone. It'll just be a meadow where they were. That's one of my favorite sort of facts of the show right there. Yeah. It's hard to imagine this stuff, but yeah. What is it eroding at like 0.1 millimeter per year? And again, we're talking on timelines of hundreds of millions of years here. Right.
So 88 million years. Yeah, that's it. Just go romp in the meadow. Yeah, because even if we're just going back to the Cambrian explosion and you can argue that you can go back further like Jason Wright did. But even if you're just going back 540 million years, that means continental crusts have reinvented themselves twice since then. The Earth's surface has been recycled countless times. Apparently the oldest...
surface stretch of earth is only is like less than 2 million years old. Oh, geez. That's really young. Yeah. And the reason all this stuff is hard to imagine, like the Himalayas going away, because our sense of time is so limited to about the span of a lifetime. Yeah. Plus a couple of decades, maybe.
that when we start to think of tens and hundreds of millions of years into the future or the past, we just stop. It just doesn't really make sense to us unless we really apply ourselves with episodes like this. Yeah, exactly. So you've got plates colliding. You've got glaciers do all sorts of – they move entire regions around like bulldozers. But even something as humble as the movement of earthworms through the soil –
Over enough time, that's going to erode fossils, ruins, subterranean networks of pipes. And essentially, we're back to square one trying to figure out what to look for for an ancient civilization.
Are we done? Almost. All right. Maybe we should take a break and we'll come back and talk about why we're striking out and where we go next.
Hey there, it's Ryan Seacrest for Safeway. It's back to deals time. Now through August 13th, enjoy store-wide deals and earn four times rewards points. Look for in-store tags for eligible items from all free and clear detergent. For
For a healthy routine. Then clip the offer in the app for automatic event-long savings. Enjoy savings when you shop in-store or online. For easy drive-up and go, pickup or delivery. Restrictions apply. See website for full terms and conditions. Visit Safeway.com for more details. Amazon One Medical presents Painful Thoughts.
I could catch anything sitting in this doctor's waiting room. A kid just wiped his runny nose on my jacket. And the guy next to me, sitting in a pool of perspiration, insists on sharing my armrest. Next time, make an appointment with an Amazon One medical provider. There's no waiting and no sweaty guy. Amazon One Medical. Healthcare just got less painful.
Hi, icons. It's Paris Hilton. Check out my new single, Chasin', featuring Meghan Trainor. Out today. ♪
I feel so lucky to collaborate with Megan and how perfectly she put my experience into words. Listen to Chasen from my new album, Infinite Icon, on iHeartRadio or wherever you stream music. Don't forget to visit InfiniteIcon.com to pre-save my album. Sponsored by 1111 Media.
Stuxnet. Who? Stuxnet. Say it one more time. Stuxnet. I don't know what that is. You know what Stuxnet is. Is that in this? Stuxnet. Stuxnet. It's a great name. You gotta quit saying Stuxnet. That's the name of it. I know. It's a great name. All right. Stuxnet with an X. Okay, Chuck, so we've seen that we can dismiss the archaeologists. Thank you, everybody. And bring in the geologists. Yeah. Like, take your whip, take your fedora, pack it all up, go take a break. Mm-hmm.
Because the geologists are on the scene. You can, Dr. Jones, you can take a seat. Right. So I can't even, like, what are the geologists like? They just, they don't have movie franchises like the archaeologists do. Yeah, I mean, they're not looking for grails. They're looking for residue. So it's not as grabby. Yeah. I guess they're, the thing that you most associate with is like a slight coffin in a really large empty room. Yeah.
Yeah, like there would never be a movie called Indiana Jones and the Ancient Tree Ring. No. You know? No.
Unfortunately, but that's what we're talking about is the fact that if we were to have a future geologist look back, that's what they would likely be looking for. Like, forget the fossils. They're going to be looking for just little bits of residue by looking at these tiny little layers of sediment that we deposit every day all over the place that eventually becomes rock.
And this is how we look back at our own past to learn things. That's how we knew that the dinosaurs were exploded basically because of that asteroid and that Cambrian explosion happened because we have studied geology.
Yeah, we've learned to study those layers that get put down and put down. The problem is on Earth's surface, as we've seen, there's the process of erosion. Yeah. And there's an entire layer across the whole globe. It's not just in one spot. But there's a billion-year stretch of the geological record that's just gone. It's missing. This is crazy. I've never heard of this. Yeah, I hadn't either. It's called the Great Unconformity. And...
Like, we'll just never know what was there or what happened during that time because there's no record of it. They think that it was just a period where there wasn't a lot of sedimentation put down, but there was a lot of erosion. So some people suggest that it was during Snowball Earth, one of those periods where like ice sheets cover the entire globe three miles thick.
and that they could erode stuff, you know, pretty cleanly across the globe. It's a pretty good theory. But stuff like that happens. So when we're looking on Earth's surface, you run into problems. But because that oceanic crust takes so much longer to recycle, we could look there and conceivably find something hundreds of millions of years old.
Yeah, I also got to say, Snowball Earth is, I mean, that's the next great Netflix show waiting to happen. Maybe that's about an adventurous geologist. Maybe so. Yeah. I love it. So, yeah, going back underwater seems to be a better bet than because of stuff like the Great Unconformity. Going back underwater where that process of wearing stuff away is much, much slower is probably a better bet for us and a better bet for us.
future geologists. Yeah, because all the stuff that enters the ocean or is born and lives and dies in the ocean, it becomes detritus that eventually tumbles down to the ocean floor.
And it gets locked in as sediment there. And it happens really, really slowly. Like I think 0.8 centimeters every thousand years is about the average sedimentation. So that means that so far we have accumulated about 0.16 centimeters of ocean sediment that would bear our presence, possibly even bear the signals that we ever lived. But we're doing, we're adding to it every day.
Thanks to things like nitrogen fertilizer that we overuse that enters the watersheds and eventually goes to the ocean and then goes and gets trapped in sediment. And so if you were a future archaeologist or geologist and you were looking at the layer where we existed, you'd be like, what is all this nitrogen suddenly doing here?
And then also, what are these weird polymers that used to be our plastic from all the stuff, all the plastic that ends up in our oceans? Those will eventually fall down to the bottom and become trapped in the sedimentary layer too. Yeah. So that super soaker that your kid lost beyond the point where the waves would bring it back in is eventually going to end up at the bottom or the trash layer.
that is floating around the ocean, all that stuff is going to go down as well. And so this is going to leave behind like a trace, a sediment trace, where a future geologist might say, well, hey, I see that there was a specific time period 100 million years ago where there was a spike in nitrogen or a spike in these weird human-made polymers.
Or maybe they didn't know that there were humans. Maybe they didn't know we were lizards. Yeah, something that doesn't jibe with what we have going on today. There are all these weird spikes. So there was clearly something going on in this time that we now think of as our time here on planet Earth. Yeah, because that's how we find mysterious signals in the geological record. You compare it to what's above and what's below it. And if something suddenly appears or disappears, you know, like it's like, look here, look closer here.
Radioactivity will probably be a marker that we'll be behind too from all the nuclear tests. There'll be plutonium-244 and iodine-129, which have half-lives in the tens of millions of years. If we end up going out in a massive nuclear war, you bet that will leave quite a signal in the geological record. And one of the other things about leaving a record in oceanic crust is
is that the Earth goes through cycles of cooling and warming and cooling and warming. And when it cools, the sea levels decline. It gets sucked up into ice. And so what's under the ocean may end up hundreds of miles inland.
Right. Future archaeologists to find probably more easily than they would if it were underwater at the time. Yeah, for sure. So, you know, sort of striking out all over the place such that our old astronomer friend Jason Wright is like, maybe Earth is not the place to look. Maybe you should be you know, we should be looking on a place like Mars that doesn't have plate tectonics and is probably a better, more hospitable place.
for some ancient thing to be discovered one day. Yeah. And not necessarily a Martian civilization, but an intelligent earth civilization that sent probes to Mars or something like that. The European space agency also points out that if anybody had been around to send a, um, uh, like a probe out into geosynchronous orbit, the furthest reaches of geosynchronous orbit around earth, it would still be there. It
Orbit wouldn't have collapsed yet. So, you know, we just need to look for 66 million year old probes spinning around Earth. That's a good start too.
Yeah, so all of this sort of presents a paradox. It's pretty interesting, which is that if you're going to be an industrialized civilization that lasts long enough to leave something behind for some future geologist to find, then that means that you found some sort of sustainable way to survive. And if you found a sustainable way to survive, that means you're not making as much of a findable impact on
on Earth, you're living more sustainably. And so you're not dumping plastics into the ocean or nitrogen into the ocean and sort of cleaning up your act and erasing your path a little bit better. If you're not doing that, then that means you haven't found a sustainable way to live. So that means you're going to, as a society, die out much quicker.
So you're going to be just a shorter blip. So either way is just going to make things more difficult. Yeah. Whether you're long-lived or short-lived, the record you leave is going to end up just being a blip in the geological record, right? Yeah. Again, on that huge timeline. So...
I'm sure some people are pulling their hair out. They're like, how then? Like, is it even possible to find signals that an ancient civilization existed or what signals? Well, we leave two, and yes, there are. And what you want to look for is not the, like, traces of fossils or strange appearances of elements in the geological record and sediments. Instead, you want to look at the impressions that the effects of those things had on Earth.
Because those get locked into geological records and they can stay around for a very, very long time. So much so that we can look back into Earth's far, far, far distant past. And we see signals that we're like, can't rule out that this some industrialized ancient civilization produced these effects on Earth because we don't know what happened.
Yeah, exactly. And what we're talking about is something called a hyperthermal event where three things kind of line up, which is an abrupt extinction of maybe not everything, but many, many, many species. That's pretty obvious that coincides with the buildup of carbon in the atmosphere and a lot of rapid coastal erosion. All of those three things happening at once is called a hyperthermal event. And it's a pretty good indication that,
that something really, really big happened to wipe out most everything. Yes. And usually the hyperthermal events we found are caused by negative carbon isotope extrusions, which is basically just a different way of saying a ton of organic CO2 was pumped into the atmosphere. And it had all of these...
telltale marks of sea level rise leading to erosion, mass extinctions, dogs and cats living together, all that stuff, right? And so if we look in the past, there are events that coincide with this. One of them is the Paleocene-Eocene Thermal Maximum, the PETM. It took place about 56 million years ago. So basically...
After the dinosaurs died out and right after mammals started to take over Earth. Yeah. It got really hot. And I was trying to figure out how hot. The surface temps in the Arctic Sea were about 73 degrees Fahrenheit, 23 degrees Celsius. That's what you find today around the panhandle in the Gulf of Mexico. Yeah. These are the Arctic Seas. Today, the global annual surface temperature is about 59 degrees Fahrenheit, 15 Celsius. Wow.
Back then, it was 90 degrees Fahrenheit or 32 degrees Celsius. That's the global temperature, the average across all of the globe. So it was really, really hot. And they have traced that to tons of carbon dioxide suddenly appearing in the atmosphere, causing all these changes. Yeah, and that lasted for about 100,000 years. But that's not the only one. There have been other events similar to that in the Cretaceous period, in the Jurassic period.
uh, in the paleozoic era. Uh, and then in the 6 million years since, uh, the PETM, the paleocene eocene thermal maximum, uh, there were even more of those hyperthermal events. And again, they sort of all bore the same, uh, similarities, right? Yeah. Because there's only so many ways that earth responds to being messed with. Yeah. And, um,
So like all of these things kind of do bear a striking similarity. And there are things, there's natural things that you can point to that could have caused them, like massive volcanic activity across Earth or a sudden huge deposit of shale ended up in the mantle and got recycled very quickly and all sorts of CO2 was released in the air. Who knows? But what Schmidt and Frank basically point to is like,
And again, they don't think this is correct. They say, like, you can't rule out that this is a marker of an ancient civilization creating climate change in exactly the same way that we're creating climate change today. Because we are laying down the foundations of a geological signal that will be detectable hundreds of millions of years in the future as a hyperthermal existence.
Exactly like the ancient hyperthermals we've discovered in Earth's past. Yeah, which is basically if we do ourselves in with climate change.
Yeah, because they're predicting if we just keep going with fossil fuels just for the rest of the century, by the end of the century, we'll have increased the global temperature by about 4.8 degrees Celsius. Which is huge. That qualifies as a hyperthermal maximum. And that PETM, like the biggest hyperthermal maximum that ever happened all of a sudden, that took place over like a thousand plus years. We're doing this in a couple hundred years. Yeah.
So it will really stick out in the geological record. Yeah, I think the PETM had a 5 to 7 Celsius degree rise. And if we're looking at 4.8 in that span of time, that's trouble. Yeah, and that's just by the end of the century. Who knows if we just keep going? We're not quite sure when the whole thing will steady itself out and what the peaks will be when it does, you know? Yeah.
So there's one other thing that I found really interesting is that the fossil fuels that we're using to create inadvertently this hyperthermal and Earth's geological record is created from the mass extinctions from the past. Those die offs turned into fossil fuels that we use today to to essentially add all that carbon to the atmosphere, which is creating these warmer conditions.
Yeah. And then if you take it one step further, we're eventually going to create these mass extinctions that will create the fossil fuels for another industrialized civilization to come tens of millions of years in the future. That's right. We're just insignificant, aren't we? Yeah. But also overly significant.
That's right. If you really want to get that driven home, go read Peter Brandon's The Anthropocene is a Joke. It really, it almost made me feel like fine about climate change because it just, in the grand scheme of things, it's so insignificant. I had to be like, no, no, it matters. It's important. Stop thinking like that. Yeah. I know what you mean. So you got anything else? I got nothing else. This is long awaited for us and a lot of fun. Yeah. Let's hope we remembered to press record.
God, I would just retire. Well, since Chuck said he would just retire, of course, that means he's triggered listener mail. Yes, this is a story from Dylan. This is one that I know about.
or knew about, but I don't know if we ever talked about it, but it's a pretty interesting little thing. Okay. Hey, guys. I've been listening to you for about two years. Helps cut down on my commute, and I often learn a lot. During the hitchhiking ep, you were talking about the Curb Your Enthusiasm episode where Larry David picks up a sex worker so he can ride in the carpool lane to a Dodgers game, and I wanted to let you know something about that episode. Did you know this? No, I thought this was amazing. Yeah. Yeah.
That episode was actually used to help secure an alibi for a man, Juan Catalan, who was arrested for murder. They filmed the episode during an actual Dodgers game, and it just so happened that Juan and his family were sitting in the same section as Larry David when they were filming, and Juan's lawyer used the raw footage from the episode to help exonerate him.
So they picked up this guy for murder. Yeah. And they proved him wrong thanks to this Curb Your Enthusiasm footage. He was like he was at the Dodger game. Yeah. He couldn't have done it. God did not want Juan in jail. Amazing. There's a short documentary on Netflix called Long Shot, and it is truly one of the stories you can't believe is true. Got to see it. Thanks for the years of entertainment. I love sharing the knowledge with you guys through listener mail. Stay positive and keep testing negative. Dylan.
Awesome, Dylan. You're a cool cat, we can tell. Thanks a lot for that great email. That was amazing, and we will definitely go watch Longshot very soon. Totally. If you want to get in touch with us like Dylan did, you can send us an email. Send it off to stuffpodcasts at iheartradio.com. Stuff You Should Know is a production of iHeartRadio. For more podcasts from iHeartRadio, visit the iHeartRadio app, Apple Podcasts, or wherever you listen to your favorite shows.
Hey there, it's Ryan Seacrest for Safeway.
For easy drive up and go, pickup or delivery. Restrictions apply. See website for full terms and conditions. Visit Safeway.com for more details.
We're PaintCare, and we're all about keeping it simple. We make recycling leftover paint easy with convenient locations like your local paint store. We have three simple rules for painting smarter and reducing waste. One, buy only what you need. Two, use up what you already have. And three, recycle the rest. Visit paintcare.org slash three simple rules to learn more or find a paint drop-off site near you.