Which billionaire co-founded a charitable foundation with his then-wife Melinda in 2000, giving it tens of billions of dollars?

In 2008, which U.S. agency issued a warning against eating certain frozen mussel products imported from Ireland? In 2008, which Impressionist's "Le Bassin aux Nymphéas" sold for about $80 million? Which state is nicknamed the "Buckeye State"? Which golfer won the 1997 Masters at age 21 by a record 12 strokes? In 431 BC, Thucydides began writing the history of which war while he was fighting in it? Which pop artist's New York studio was known as The Factory? In a 1931 issue of The New Yorker, who quipped, "Theodore Dreiser should ought to write nicer"? In a 1947 novella by John Steinbeck, a diver named Kino finds which valuable title object to pay his child's doctor bil…