1993 - CanadiansprinterBen 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 spaceprobe orbiting the moon had found enough water in polar craters to support a human colony and rocket fueling station.
... of the quadratic formula is not ideal. See Loss of significance for details.
Derivation
The quadratic formula is derived by the method of completing the square[?]. ...