Think you have it together? Then, you'll want to thank the four fundamental forces of nature. They hold the universe together, govern everything that happens, and generally make it what it is today. Discover their universal properties and how they're in action all around us. From the gravitational pull that with may cause an errant asteroid to wallop Mars, to the electromagnetic phenomena that make asteroid showers an impressive sight. Also, physicist Freeman Dyson makes the case for spacecraft propelled by nuclear bombs.Plus - the four forces are governed by fundamental laws, but are these laws made to be broken? Find out whether you could zip through space at faster than light speed.Guests: Freeman Dyson - Professor Emeritus, Institute for Advanced Study, Princeton University Andrew Fraknoi - Chair of the Astronomy Department at Foothill College, Trustee at the SETI Institute, and author of Wonderful World of Space Peter Jenniskens - Meteor expert/astronomer at the SETI Institute David Morrison - Senior Scientist at NASA Ames Research Center Mario Livio - Physicist at the Space Telescope Science Institute Laurance Doyle - Astronomer at the SETI Institute Less