1842 - Over 500 Mexican troops led by Rafael Vasquez invade Texas briefly occupy San Antonio and then head back to the Rio Grande. This is the first such invasion since the Texas revolution.
1970 - A nuclear non-proliferation treaty goes into effect after ratification by 43 nations.
1993 - Canadiansprinter Ben Johnson is banned from international competition for life after testing positive for banned substances for the second time.
1998 - NASA announced that that the Clementine probe orbiting the Moon had found enough water in polar craters to support a human colony and rocket fueling station.