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NASA Explodes Marbles for Safety's Sake
SPACE.com   Saturday, 17 March 2007
SPACE.com - NASA jobs have long been coveted for their cool factor. Bill Cooke's current project is no exception. Cooke is slamming quarter-inch-diameter Pyrex glass marbles into soil at 16,000 mph (7 kilometers per second) just to watch them explode.
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