Bicycle Day, celebrated annually on April 19, commemorates the world’s first recorded LSD trip, in 1943. That’s when Swiss ...

BIRMINGHAM, England — Half a century after Timothy Leary urged the world to “Turn on, tune in, drop out,” there’s a surge of interest in lysergic acid diethylamide, or LSD. The psychedelic drug was ...

Albert Hofmann calculated that one teaspoon of LSD could affect 50,000 people. He arrived at that figure after accidentally ...

This day—April 19—is the 78th anniversary of the first-ever acid trip. It is affectionately referred to by psychonauts around the globe as Bicycle Day. The psychedelic compound LSD is known primarily ...

In November 1956, three people gathered in a converted Connecticut barn to take LSD, a powerful psychedelic drug that was legal at the time. The children had just been put to bed upstairs. In the ...