Another Look at The World Without Us; and What's New At Scientific American

In this episode, journalist Alan Weisman continues his discussion (started on the June 27th podcast) about his bestselling book "The World Without Us," a massive thought experiment about the aftermath of humanity's sudden disappearance. And Scientific American editor-in-chief John Rennie discusses what's up at the magazine. Plus we'll test your knowledge of some recent science in the news.

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