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Full Program: Watch the full documentary on Lennon's life in New York City during the 1970s 01:54:10
Engineer Emily Whiting studies the principles behind historical buildings to help architects design new buildings. She scales other tall objects, too—she's a rock-climber. 01:47
Jimmy Fallon sings ""Pocket Full of 'H's'"" Check out more from The Electric Company on PBS KIDS GO! 00:48
Quantum mechanics is nothing to laugh at. Well, sometimes it is. 01:30
FRONTLINE embeds with Bravo Company of the Army's 1st Infantry division in the Korengal River Valley, one of Afghanistan's most dangerous fronts. 02:57