When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: curioustiger/Getty Images Difficult births are not unique to humans, a new analysis of ...

Human newborns arrive remarkably underdeveloped. The reason lies in a deep evolutionary trade-off between big brains, bipedalism and the limits of motherhood.

It takes a huge amount of energy for human brains to grow to their current large size and be maintained over time. Our early human ancestors evolved to grow bigger brains, but the biological changes ...

Complicated births may not have arisen in humans as a trade-off between our need for big brains and pelvises suitable for upright walking, new research in chimps suggests. When you purchase through ...