Physicists are using the largest telescope in Antarctica to probe the farthest edges of the universe. South Pole Telescope scientists discuss their 280-ton scope, what they hope it will show them -- and what it's like to live and work on the southernmost continent.

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Guests discuss some of science's most unusual research and what it's like to be a human "lab rat." We'll hear from one woman who was blindfolded for five days in the name of science, and another participant who spent 84 days lying in bed.

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Three world explorers -- a photographer, an acoustician and a scientist -- talk about documenting wildlife in the most remote places on Earth. We'll track jaguars through the jungles of Belize, scope out rare mountain goats in India, and eavesdrop on barking baboons in Zimbabwe.

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NASA astronomers are monitoring a 164-foot wide asteroid that is headed in the direction of Mars at about 28,000 miles per hour. Scientists say that the space rock has a 1-in-75 chance of colliding with the Red Planet.

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Mike Gravel, former Alaska senator and Democratic presidential hopeful, talks about his upcoming campaign stops. Gravel trails behind the other candidates in fundraising and poll numbers, but his campaign videos have attracted a following of younger voters.

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