Neanderthals leave their mark on us

Neanderthals shared a common ancestor with humans about 600,000 years ago, and didn’t go extinct until 30,000 years ago.  Scientists have been able to reconstruct most of the Neanderthal genome using fossil fragments, and found that humans must have interbred with them in the past, since some DNA is similar between Neanderthals and modern-day Europeans …

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The sloth’s busy inner life

Three-toed sloths are not just unusual animals for moving so slowly.  Their fur actually contains an entire ecosystem of organisms! Sloths have algae that grow in their fur (specifically, in grooves and channels in their hair) and a species of moth that burrows in its hair (perhaps up to 100 moths on a single sloth!). …

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