People in central Russia are cleaning up from the effects of a 10-ton meteor that exploded high above Earth's surface on February 15. The explosion was as powerful as dozens of atomic bombs. The blast caused shock waves that shattered windows, damaged buildings and hurt nearly 1,500 people. A large meteor enters the atmosphere about every five years, says mineralogist Addi Bischoff. Most of the pieces fall on uninhabited areas where they don't injure humans.

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