March 14 is Pi Day, which celebrates the mathematical constant measuring the ratio of a circle's circumference to its diameter (beginning with 3.14). Pi Day is celebrated internationally, and in 2009 it was decreed an official holiday by the US House of Representatives. Here are 3.14 ways to celebrate.
Moon explosion: An explosion on the moon could be seen on Earth in March as a boulder-sized object smashed into the lunar surface at 56,000 miles per hour.
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