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Instead of another moon landing, Gregg Easterbrook would like to see taxpayer money used to protect Earth against asteroids.
Conn Iggulden wants to make it clear that an ordinary person can be a hero, and we can all be inspired by heroic stories.
Charlie Crist drops out of Florida's Republican primary, and Abel Maldonado promotes California's Proposition 14. Stephen asks Damian Kulash and Tim Nordwind if they ever make videos with their groupies.