In this episode, Dr. Katie Mack gives John Green an idea of what to expect for the future of our universe. 

Head to https://policygenius.com/crashcourse to get your free life insurance quotes and see how much you could save.

This show is a production of Complexly. If you want to help keep Crash Course free for everyone, forever, you can join our community on Patreon at  http://www.patreon.com/crashcourse 

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