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Billy Collins talks about his writing persona and the responsibilities of a poet laureate before joining Stephen in a joint reading from "Aimless Love."
Orlando Bloom talks about his Broadway debut in "Romeo and Juliet," his love of the theater and his preference for iambic pentameter.
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.