Throughout human history, three caste systems have stood out. The tragically accelerated, chilling, and officially vanquished caste system of Nazi Germany.

Researchers say they have identified a new species of ancient hominin, Homo juluensis, that could help solve another big mystery of human evolution. Their proposal is sparking debate in the scientific ...

The pseudoscientific practice of physiognomy, dismissed as junk science centuries ago, is seeing a high-tech revival.