In the 1950s, Gordon and Valentina Wasson encountered magic mushrooms. Then they wouldn't stop talking about them.

“If someone is from the Amazon,” says Evgenia Fotiou, an anthropologist who studies Western ayahuasca usage, “they bring some legitimacy” to an ayahuasca ritual.

From Aztec medicinal remedies to Darwin’s study of flower pollination, local knowledge about the runner bean reveals the importance of biodiversity.

Some scholars have suggested that humans first started growing domesticated grains in order to make not bread, but beer.