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Madison, Wis., is one of the best large cities in the U.S. to age successfully, according to the Milken Institute. Photo courtesy of Flickr user Madison Guy. Great hospitals! Good public transportation! Booming economy! The best small city for…

Marc Abrahams, editor of Annals of Improbable Research and Guardian columnist, joins Hari Sreenivasan to talk about graphene, the world's new wonder material. The substance, as thin as an atom, is 200 times stronger than steel.

In a monthly column for PBS NewsHour, Dr. Howard Markel revisits moments that changed the course of modern medicine, like the invention of the stethoscope. Photo By BSIP/UIG via Getty Images. Long before Hippocrates (ca. 460-380 B.C.) taught his…