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16-year-old Jack Andraka explains how he devised a new way to detect cancer, which earned him the grand prize at the Intel International Science and Engineering Fair.
Billy Collins talks about his writing persona and the responsibilities of a poet laureate before joining Stephen in a joint reading from "Aimless Love."
Zach Sims discusses Codecademy, his wildly popular website that provides free coding lessons to over 10 million people.