AC360 Thursday 8p

There are growing questions about the Bluefin-21 search for Flight 370. What's happens when it completes its sweep? The latest tonight on AC360.
February 15th, 2013
11:25 PM ET

Physicist: Over 100 tons of material falls daily

Physicist and cosmologist Lawrence Krauss explains the science behind the meteor that exploded over Russia and the asteroid that was approaching earth on Friday.

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