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Marcelo Gleiser is a contributor to the NPR blog 13.7: Cosmos & Culture. He is the Appleton Professor of Natural Philosophy and a professor of physics and astronomy at Dartmouth College.

Bruce Warren is assistant general manager for programming of WXPN in Philadelphia. Besides serving as executive producer of World Café, Warren also contributes to Paste magazine and writes for two blogs: Some Velvet Blog and WXPN's All About The Music Blog.

Joe Neel is NPR's deputy senior supervising editor and a correspondent on the Science Desk.