00:48 The mystery of Stonehenge’s Altar Stone

Stonehenge’s central stone came from Northern Scotland, more than 600 miles away from the monument, according to a new analysis of its geochemistry. It is commonly accepted that many of the rocks that make up the iconic neolithic monument came from Wales, 150 miles from the site. Previously, it had been thought that a central stone, called the Altar Stone, had also come from this area, known as the Preseli Hills. The new work suggests that the ancient Britons went much further, perhaps ferrying the Altar Stone hundreds of miles, to place the rock at the centre of Stonehenge.

Research Article: Clarke et al.

News: Stonehenge’s massive slabs came from as far as Scotland — 800 kilometres away

12:12 Research Highlights

How a parasite could help scientists break through the blood-brain barrier, and the physics of skateboard moves.

Research Highlight: Engineered brain parasite ferries useful proteins into neurons

Research Highlight: How expert skateboarders use physics on the half-pipe

14:13 A new way to break bonds

Chemists have demonstrated a way to break Selenium-Selenium bonds unevenly, something they have been trying for decades. Chemical bonds have to be broken and reformed to create new compounds, but they often don’t break in a way that allows chemists to form new bonds in the ways they would like. Breaks are often ‘even’, with electrons shared equally between atoms. To prevent such an even split, a team used a specific solvent and a combination of light and heat to force the selenium bonds to break unevenly. This could potentially open up ways to create compounds that have never been made before.

Research Article: Tiefel et al.

News and Views: Innovative way to break chemical bonds broadens horizons for making molecules

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The mystery of Stonehenge's central stone unearthed