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Fossilized dinosaur teeth can reveal a lot more than just how these creatures ate and who they were related to – they can also tell us what the air was like in prehistoric times. As it turns out, humans might have found it hard to breathe if we were around the same time as dinosaurs, because there was a lot more carbon dioxide in the atmosphere than you’d expect.

That’s from a fascinating study by a team of geochemists and geologists at the University of Göttingen in Germany. The…

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