April 04

1969 - Dr. Denton Cooley implants the first temporary artificial heart.
1983 - Space Shuttle Challenger makes its maiden voyage into space.
1996 - Comet "Hyakutake" is imaged by the USA Asteroid Orbiter Near Earth Asteroid Rendezvous.

2063 - A Borg sphere arrives from 2373, in an effort to prevent first contact between Humans and Vulcans.