Kelly and Zach Weinersmith: A Second Home on Mars?

Clear+Vivid with Alan Alda - A podcast by Alan Alda - Tuesdays

Should we be planning to establish settlements on the moon and Mars? To many, including a couple of billionaires, the idea has become almost an obsession. An unlikely husband and wife duo has spent years digging deeply into plans to colonize space. Their conclusion: not so fast.