Diplo says he ran a marathon while on LSD. You're not alone in wondering if that's a good idea. Here's what medical experts say about psychedelic use.

It's been reviled and revered, criminalized and exploited by the CIA. And now and other psychedelic drugs are being tested as legitimate medical treatments. NPR's original animation tells the tale.

Among psychedelic enthusiasts, April 19 or Bicycle Day honors a mind-altering ride taken by the Swiss chemist who created LSD.

Scientists have for the first time scanned the brains of people using LSD and found the psychedelic drug frees the brain to become less compartmentalized and more like the mind of a baby.