41.   Human ancestors developed after an evolutionary split with the ancestors of apes.

42.   In recent months, two other research teams have challenged long-held assumptions about what ancient creatures were truly human ancestors.

43.   It combines features of both the human ancestor Homo erectus and modern man, or Homo sapiens, the researchers said.

44.   Keightley speculated that human ancestors who carried the most flaws were least likely to have children.

45.   Paleontologists for years have debated whether human ancestors ever lived in trees.

46.   Researchers unearth fossil face of human ancestor.

47.   Researchers find possible new human ancestor who carved meat.

48.   She married fossil hunter and Kenya wildlife activist Richard Leakey, whose parents, Louis and Mary Leakey, made major discoveries of human ancestors in East Africa.

49.   The fossil provides new information on the arrival of human ancestors in Europe from Africa, said paleontologist Josep Gibert.

50.   The shape of the leg bone left no doubt that human ancestors walked upright, Mrs. Leakey said.