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Emmalyn Johnson, 3, tries on her free pair of eclipse glasses at Mauney Memorial Library in Kings Mountain, North Carolina on Aug. 2. Glasses are being given away at the library for free while supplies last ahead of the big event on Aug.21.

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What's a total solar eclipse and why this one is unusual

CAPE CANAVERAL, Fla. (AP) — Total solar eclipses occur every year or two or three, often in the middle of nowhere like the South Pacific or Antarctic. What makes the Aug. 21 eclipse so special is that it will cut diagonally across the entire United States.

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