Dunbar, professor of evolutionary anthropology at Oxford University, says that may work while you're at university.

BBC: Google+ and the friends v acquaintances debate

Dr Sanz worked on the paper with Josep Call, also from the Max Planck Institute of Evolutionary Anthropology, and David Morgan from the Wildlife Conservation Society and Chicago's Lincoln Park Zoo.

BBC: Chimps craft ultimate fishing rod

So researchers at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, decided to compare adult chimpanzees, gorillas and bonobos with human children of a year or 18 months in age.

ECONOMIST: Human evolution

Following five painstaking years spent extracting her bones from their sandstone casing, Zeresenay Alemseged of the Max Planck Institute for Evolutionary Anthropology, in Leipzig, and his colleagues have described her in Nature.

ECONOMIST: An ancient child has been discovered

But about 1 million years ago the mountain gorillas were cut off from their cousins in West Africa, perhaps by drought, says Olaf Thalmann of the Max Planck Institute for Evolutionary Anthropology in Germany.

FORBES: Magazine Article

To find out if chimpanzees share this sense of fairness, Keith Jensen and his colleagues at the Max Planck Institute for Evolutionary Anthropology, in Leipzig, designed a way for chimps to play the ultimatum game.

ECONOMIST: Evolution

And anthropology is not the only human science to have been infused with evolutionary theory.

ECONOMIST: The proper study of mankind