Richard Dawkins's review of The Social Conquest of Earth, by Edward O Wilson (WW Norton, £18.99, May)

One of the first creatures to step on land could not have walked on four legs, 3D computer models show.

Human Races May Have Biological Meaning, But Races Mean Nothing About Humanity

New evidence proves humans are continuing to evolve and that significant natural and sexual selection is still taking place in our species in the modern world.

Cool cats. The skull and jaw of two different species of extinct saber-toothed cats, which lived during the heyday of carnivores 3 million to 3.5 million years ago in the Turkana Basin of Kenya.

Rare Protozoan from Sludge in Norwegian Lake Does Not Fit On Main Branches of Tree of Life

In a broader sense, it could also reveal more about why animals, including humans, do things that are potentially risky but that benefit someone else.

"In previous studies, she's managed to distinguish between two objects that differed in width by less than the thickness of a human hair."

This could be especially important for the development of treatments for slow-healing skin wounds in malnourished, hypothermic, diabetic and elderly patients.

Zebra stripes evolved to keep biting flies at bay