One final episode from our live event, featuring a debate, questions from listeners and the dramatic and unplanned collapse of a dancing robot. By Kevin RooseCasey NewtonRachel CohnWhitney JonesVjeran ...

Isaac Newton – isn't he the guy who discovered gravity? Great! So, what's gravity? Aaaah, gravity is the force that makes objects fall towards the ground. And, without gravity, we'd all float! Hmmmm… ...