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The famed neurologist talks to Fresh Air about how grief, trauma, brain injury, medications and neurological disorders can trigger hallucinations — and about his personal experimentation with hallucinogenic drugs in the 1960s.

Obesity is now classified as a disease, according to the American Medical Association. David Kessler is the former Commissioner of the FDA and author of the book, The End of Overeating. He speaks to guest host Celeste Headlee about this week's decision, and how it could impact America's overeating epidemic.

China's "Tianhe-2" (Milky Way 2) supercomputer took first place in one recent speed test, clocking in at 30 quadrillion calculations per second--about twice as fast as the best American machines. The U.S. still has more supercomputers than any other nation, but some experts say computer speed is a measure of a country's scientific innovation, and worry the U.S. is lagging behind.

Local African-American leaders are celebrating the addition of the original Buffalo Zoo entrance to the National Register of Historic Places. Karen…

The Greeks have been eating octopus since ancient times, but there's an art to grilling these tentacled sea creatures. An octopus has to be dried in the sun for at least a day first. Otherwise, the flesh just steams and turns into "a rubbery mass."

West has been busy in both the music and gossip worlds: He's just released a new album, titled Yeezus, and fathered a child. Rock critic Ken Tucker says West's constant blending of his public life and his music makes his new record all the more striking — and at times problematic.

Coffee beans are filled with oils that emerge from coffee grounds under high pressure. These oils form the crema - "the frothy stuff" on top of an espresso. In the last installment of Science Friday's series on coffee, food-science writer Harold McGee, author of On Food and Cooking, explains the chemistry of crema.

A new season begins this week at the renowned Chautauqua Institution. Over the next nine weeks, more than 100,000 people will visit Chautauqua for…

Herb Citrin, the man known as "Mr. Valet," died this past week at the age of 91. Citrin pioneered valet parking in Los Angeles more than 60 years ago.

Weekend Edition Saturday host Scott Simon talks with Washington Post investigative reporter Robert O'Harrow about the merging of public and private surveillance and the growth of the "security-industrial complex" in the U.S.