Foam-Impact Test Confirms Cause of Columbia Disaster

Investigators say they are certain a piece of insulating foam that hit part of Columbia's wing was the cause of the space shuttle's Feb. 1 accident. A chunk of foam insulation fired at shuttle wing parts as part of a test Monday creates a 16-inch hole, yielding what one investigator calls the "smoking gun" that proves what brought down the spaceship. Hear NPR's David Kestenbaum.

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