Today is Monday, Feb. 20, the 51st day of 2012. There are 315 days left in the year. This is Presidents' Day. On Feb. 20, 1962, astronaut John Glenn became the first American to orbit the Earth as he flew aboard Project Mercury's Friendship 7 spacecraft. In 1790, Holy Roman Emperor Joseph II died. In 1792, President George Washington signed an act creating the U.S. Post Office. In 1809, the Supreme Court ruled that no state legislature could annul the judgments or determine the jurisdictions of federal courts. In 1839, Congress prohibited dueling in the District of Columbia. In 1862, William Wallace Lincoln, the 11-year-old son of President Abraham Lincoln and first lady Mary Todd Lincoln, died at the White House, apparently of typhoid fever. In 1907, President Theodore Roosevelt signed an immigration act which excluded "idiots, imbeciles, feebleminded persons, epileptics, insane persons" from being admitted to the United States. In 1938, Anthony Eden resigned as British foreign secretary following Prime Minister Neville Chamberlain's decision to negotiate with Italian dictator Benito Mussolini. In 1944, during World War II, U.S. bombers began raiding German aircraft manufacturing centers in a series of attacks that became known as "Big Week." In 1965, the Ranger 8 spacecraft crashed on the moon, as planned, after sending back thousands of pictures of the lunar surface. In 1971, the National Emergency Warning Center in Colorado erroneously ordered U.S. radio and TV stations off the air; some stations heeded the alert, which was not lifted for about 40 minutes. In 1987, a bomb left by Unabomber Ted Kaczynski exploded behind a computer store in Salt Lake City, seriously injuring store owner Gary Wright. Soviet authorities released Jewish activist Josef Begun. In 2003, fire broke out during a rock concert at The Station nightclub in West Warwick, R.I., killing 100 people and injuring about 200 others. Ten years ago: President George W. Bush visited Korea's demilitarized zone, where he peered at the North, a country he'd described as being part of an "axis of evil." A Cairo-to-Luxor passenger train caught fire, killing some 360 people. At the Salt Lake City Winter Olympics, Jim Shea won the men's skeleton race, finishing the two runs at Utah Olympic Park in one minute, 41.96 seconds. The victory was the culmination of an emotional two months for Shea, whose 91-year-old grandfather, Olympic gold medal speedskater Jack Shea, had died four weeks earlier. American speedskater Apolo Anton Ohno won the 1,500 meters after South Korean Kim Dong-sung, who'd crossed the finish line ahead of him, was disqualified. Five years ago: In a victory for President George W. Bush, a divided federal appeals court ruled that Guantanamo Bay detainees could not use the U.S. court system to challenge their indefinite imprisonment. In New Orleans, thousands of hurricane-weary residents joined with rowdy visitors to celebrate the second Mardi Gras since Katrina.