Author David Brin Considers and Writes "Existence"

The Envelope Please: Choosing the 2007 Mars Scout Mission, Part 2Learn more about your ad choices. Visit megaphone.fm/adchoicesSee omnystudio.com/listener for privacy information.See omnystudio.com/li...

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The Envelope Please: Choosing the 2007 Mars Scout Mission, Part 1Learn more about your ad choices. Visit megaphone.fm/adchoicesSee omnystudio.com/listener for privacy information.See omnystudio.com/li...

28 Jul 200329min

From Russia With Love: A Solar Sail UpdateLearn more about your ad choices. Visit megaphone.fm/adchoicesSee omnystudio.com/listener for privacy information.See omnystudio.com/listener for privacy info...

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Pluto Will Finally Get a VisitorLearn more about your ad choices. Visit megaphone.fm/adchoicesSee omnystudio.com/listener for privacy information.See omnystudio.com/listener for privacy information.

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An Encore for Sir Arthur and Another New Extrasolar PlanetLearn more about your ad choices. Visit megaphone.fm/adchoicesSee omnystudio.com/listener for privacy information.See omnystudio.com/listener ...

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Bill Nye the Science Guy and Sandy Moondust!Learn more about your ad choices. Visit megaphone.fm/adchoicesSee omnystudio.com/listener for privacy information.See omnystudio.com/listener for privacy in...

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Joy Crisp is On Her Way to MarsLearn more about your ad choices. Visit megaphone.fm/adchoicesSee omnystudio.com/listener for privacy information.See omnystudio.com/listener for privacy information.

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Society President Wes Huntress and a Little Guy Named Biff""Learn more about your ad choices. Visit megaphone.fm/adchoicesSee omnystudio.com/listener for privacy information.See omnystudio.com/listene...

9 Jun 200328min