How big of an asteroid does it take to damage cities, states, countries, and the planet? On the fourth-annual World Asteroid Day (Saturday, June 30), we take a look at estimates from NASA, Purdue University's 'Impact Earth' simulator, and other sources.
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Born in Long Island public school year in Sweden as exchange student, went to Harvard one year, Cooper Union in NYC as Art student. Have two children, one of whom is rock mogul, the other has three daughters, one of whom has two daughters, making me (more...