The Grand Canyon becomes a national park, Michael Jackson's "Thriller" album hits No. 1, a truck bomb explodes under the World Trade Center, and teenager Trayvon Martin is shot and killed, all on this day.
19 / 31
NASA
1966: The first Saturn 1B rocket is launched from Cape Canaveral, Fla., on an unmanned suborbital test flight in the Apollo moon program. The mission demonstrated the structural integrity of the rocket and the compatibility of the launch vehicle to carry Apollo loads.