Did hallucinogens play a crucial role in human evolution? Terence McKenna has devoted most of his life to exploring this question. A specialist in the ethnomedicine of the Amazon Basin, McKenna along with his partner Kat Harrison McKenna founded...

Interesting facts about shamanism from HubPages 1. Shamanism is the oldest and most widespread method of healing. There is archaeological evidence suggesting that the techniques of the shaman are at least 20,000 years old, with vivid evidence of their antiquity...