Ten years ago: Fifty wild animals were released by the owner of a Zanesville, Ohio, farm, Terry Thompson, who then took his own life; authorities killed 48 of the creatures, while the remaining two were presumed eaten by other animals. Republican presidential candidates laced into each other in a debate in Las Vegas; Mitt Romney emerged as still the person to beat, even as he was called out on the issues of illegal immigration, health care and jobs. Israeli soldier Gilad Shalit (gee-LAHD shah-LEET) emerged from five years in captivity as Hamas militants handed him over to Egyptian mediators in an exchange for 1,000 Palestinian prisoners.

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This day in history, October 18: James D. Watson, Francis Crick and Maurice Wilkins honored with Nobel Prize for Medicine and Physiology for...