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Astrophysics superstar Neil deGrasse Tyson writes Astrophysics for People in a Hurry, a book that breaks down how a mere dot turned into a busy city street. deGrasse Tyson sits down with John to teach him etymology, and to explain dark matter and what you don’t see when you wave your arms around in thin air. Get a taste of John’s Tuesday interview here, and even more of it on his upcoming Saturday show!