The Snake Detection Hypothesis proposes that the ability to quickly spot and avoid snakes is deeply embedded in primates, including us - an evolutionary consequence of the danger snakes have posed to us over millions of years.
Around 10,000 years ago, a parasite made a huge leap and found its way to a new host: Us.
Here's why teeth would go on to disappear in some groups of vertebrate.
With evidence from from art, archaeology, and ancient DNA, we put together horses history.
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