I'd never seen Lake Michigan create snowballs like these. Hundreds of them, as big as pumpkins, lined the beach at Pentwater, MI. My guess: the ice chunks were tumbled in the surf, knocking off every edge and corner until they were rounded like river rocks. I wanted to stack three into a pre-fab snowman but they were frozen solidly to the sand.
I teach economics at Kalamazoo College. My wife is also an economist. We were on sabbatical in Europe for the 2014-15 academic year. (Salamanca, Spain, followed by Oxford, UK.) We were in Uruguay for the 2006-7 academic year.