Great Balls of Ice!

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Science  02 Aug 2002:
Vol. 297, Issue 5582, pp. 765
DOI: 10.1126/science.297.5582.765

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MADRID-- Two and a half years after several hefty chunks of ice mysteriously fell from a clear sky in Spain, a team of Spanish researchers has proposed a novel mechanism for generating "hail" on a clear day. Other experts are far from convinced, in part because it would take so much time to accrete such large masses that the whole notion seems implausible.