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How to keep your eyes safe during the solar eclipse

More than 31 million Americans live in the path of next week's solar eclipse, but watching it could threaten your eyesight if you're not taking proper precautions. Former NASA astronaut Mike Massimino, a professor of mechanical engineering at Columbia University, joined CBS News with safety tips before watching the eclipse. And CBS News correspondent Nancy Chen reports on the millions expected to travel for a look at the solar event.
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