Image: A 1-pound, 15-ounce hailstone that fell in Vivian, S.D.
This hailstone was found by a ranch hand in Vivian, S.D., on July 23, 2010. At 1 pound, 15 ounces it is believed to be the heaviest ever to have fallen in North America.
updated 8/2/2010 1:45:05 PM ET 2010-08-02T17:45:05

North America's heaviest hailstone ever might also be its most-traveled.

A 1-pound, 15-ounce hailstone that fell in Vivian, S.D., in July has been taken to National Center for Atmospheric Research in Boulder, Colo., about 370 miles away.

Researchers there say they plan to study the giant stone.

It's not clear what tests will be done, but the lab isn't taking any chances. A tweet announcing the hailstone's arrival said, "Hey, keep that away from the margarita mix!"

The hailstone fell on July 23. Last Friday, federal climate officials confirmed it was the heaviest ever recorded on the continent.

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