Researchers working in northeastern Ethiopia have discovered remains of a previously unknown branch of humanity. The fossils, which include teeth that date to between 2.8 million and 2.6 million years ...

A large comparative study of primate teeth shows that grooves once linked to ancient human tooth-picking can form naturally, while some common modern dental problems appear uniquely human.

Anthropologists working in East Africa's Great Rift Valley, where Earth's crust split apart millions of years ago, have discovered the first fossil evidence that chimpanzees, our closest genetic ...

Scientists may have cracked the case of whether a seven-million-year-old fossil could walk upright. A new study found strong anatomical evidence that Sahelanthropus tchadensis was bipedal, including a ...

In 1859, when Charles Darwin, armed with a mass of scientific facts, suggested that man had an ape ancestor, enthusiastic converts to his theory of evolution immediately pictured a great-grandfather-& ...