HumansHumans sleep the least of all apes – is it the secret to our success? Sleep is essential, yet humans have evolved to need so little of it. When evolutionary anthropologist David Samson delved into our ancient past to find the reasons why, he discovered surprising ways to get a better night’s rest Features
HumansHuman heads have changed shape a lot in the past 100 years Since the early 20th century, people’s skulls have got rounder and their jaws have got wider, probably because of changes in health, diet and environment News