In February 2018, a storm pelted the Argentinian city of Villa Carlos Paz with hail. The icy balls were really, really big—sometimes bigger than a grown-up’s palm, bumpy as a rock, and hefty enough to imperil people and property. The largest of these might even best the biggest on record: an icy behemoth that tumbled down in Vivian, South Dakota, in June 2010, spanning eight inches and weighing more than a pound. In a new paper in the Bulletin of the American Meteorological Society, an international team of 10 researchers…
