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What space travel teaches us about sleep and circadian rhythms

On Earth, most of us rarely have to think about the signals that keep our internal clocks aligned. The sun rises, daylig…

Iron Age skulls reveal some babies had flat head syndrome—long before the 'Back to Sleep' campaign

Nearly 3,000 years ago, in central Italy, dozens of Picene people were laid to rest curled up on their sides, as if asle…

Fossil mammal with reptile-like teeth changes picture of our evolution

Unlike most modern mammals, which get just two sets of teeth in their lifetime, an ancient species from the Cretaceous, …