We delve into the disturbing tests that ended in tragedy. On June 26, 1931, Winthrop Niles Kellogg and his wife Luella added a fourth member to their family – a baby chimpanzee named Gua.

Chilling photos show a tiny little baby ... alarming test. Gunshots were fired in another experiment to see whether it would be Donald or Gua who reacted quicker. Both the boy and chimp were ...