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The Great American Solar Eclipse

It's been referred to as "the Super Bowl of the sky" - the total solar eclipse on August 21 that will allow people across the continental United States to witness a rare and spectacular celestial event. Martha Teichner meets with retired NASA astrophysicist Fred Espenak (known as "Mr. Eclipse") and with other "umbraphiles" whose love of eclipses outshines all else.
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