2015—At the North Pole, the temperature rises above 32° for six hours. 2006—Saddam Hussein’s inelegant demise is captured by cellphone. 1994—In Brookline, Mass., John Salvi lives out his “pro-life” creed by killing two health care workers. 1978—A House Select Committee concludes that conspirators “probably” helped kill JFK and MLK. 1971—Daniel Ellsberg is indicted for having set free the truth.