Chimpanzee experiments suggest early humans were likely fascinated by crystals because of their unique transparency and ...

Morality may have existed long before humans. Experiments now show monkeys refuse unfair rewards, comfort others in distress, and act out of empathy — behavior that echoes the earliest sparks of ...

From tool-using chimpanzees to puzzle-solving capuchins, the primate world is packed with surprising brainpower. But how do ...

Human experimentation made many modern medical advances possible—but history shows what happens when ethics are ignored. Across wars, regimes, and institutions, people were subjected to cruel and ...