Join Dr. Katie Mack, a theoretical astrophysicist, and #1 New York Times bestselling author John Green as they walk through the history of the entire universe - including the parts that haven’t been written yet. The Universe debuts on April 24th.

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Ep. 1: The First Fraction of a Second

Dr. Katie Mack, a theoretical astrophysicist, walks #1 New York Times bestselling author John Green through the history of the entire universe - including the parts that haven’t been written yet.