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A 2006 conference for physicists in the U.S. Virgin Islands that included a trip to Jeffrey Epstein's private island shows how he used his wealth to build relationships with prominent scientists.

Steve Broidy reads his poem, "The Sensible Poet"

The Lady Vols' 31-year run in The Associated Press women's basketball top 25 rankings ended Monday. Under former head coach Pat Summitt, the program morphed into a dynasty.

The dollar has helped make the U.S. the most economically powerful country for most of the last century, but other countries — including rivals like China — have the greenback on their sights.

Also: A suicide bombing in Afghanistan near the U.S. Embassy kills 5; a heat wave is baking southern California; and the running community mourns Olympian David Torrence.

Four of the Pentagon's top civilian officials, including the defense secretary, resigned or were fired this week. The timing of these moves is raising questions and concerns about national security.

A 6-part series exploring the biggest questions on the frontiers of science.

Airs Tuesday, December 6, 2011 at 9:00 p.m. ET/PT. Check your local listings.

Airs Monday, May 6, 2013 at 9:00 p.m. ET/PT. Check your local listings.