Anthropologists have said human beings evolved in a straight line from Homo habilis to Homo erectus to us, Homo sapiens, over two million years. But fossil bones found in 2000 near Lake Turkana in ...

"This study clarifies a hominin fossil record that has tended to include anything that cannot easily be assigned to Homo erectus, Homo neanderthalensis, or Homo sapiens," Bae said.