Archeologists know early humans used stone to make tools long before the time of Homo sapiens. But a new discovery out this week in Nature)* *suggests early humans in eastern Africa were also using animal bones – one million years earlier than researchers previously thought. The finding suggests that these early humans were intentionally shaping animal materials – like elephant and hippopotamus bones – to make tools and that it could indicate advancements in early human cognition. *Want more on early human history? Email us at [email protected]. **Listen to Short Wave on Spotify), Apple Podcasts) and Google Podcasts).*Learn more about sponsor message choices: podcastchoices.com/adchoices)NPR Privacy Policy)