Terence McKenna: Psychonaut, Father Of The Stoned Ape Theory Of Evolution

Did prehistoric man used psychedelic drugs? (Paul Zinken/Picture Alliance via Getty Images)

Back in our pre-history, several species of humans marched to the slow and steady beat of evolution, but when homo sapiens hit the scene, they demonstrated a giant leap forward in cognitive functions. This has puzzled anthropologists. Just how did homo sapiens acquire their superior brain functions in such a short amount of time? A fish-based diet? Alien DNA? One off-the-wall pseudoscientist, amateur botanist, psychonaut, and hallucinogenic drug advocate named Terence McKenna developed his own idea: the "stoned ape" theory of evolution.