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.
... discriminant is negative, then there are two different solutions x, both of which are complex numbers. The two solutions are complex conjugates of each other. (In this case, ...