Ancient Andes society used hallucinogens to strengthen social order

Snuff tubes uncovered at Chavin de Huantar in Peru reveal how leaders used mystical experiences to cement their power.

Good karma for me, bad karma for you

Many people around the world believe in karma -- that idea that divine justice will punish people who do bad deeds and reward those who good. But that belief plays out differently for oneself versus others, according to new research.