Spacewar

The first Sci-fi video game was Spacewar!, it was created in 1961 by a group of students at MIT. The game pitted two human players against each other, each controlling a space ship capable of firing missiles. A black hole in the center created a large gravitational field and another source of hazard.

NCSA Mosaic

The first graphical Web browser to become truly popular was Marc Andreessen and Jamie Zawinski's NCSA Mosaic. It was the first browser made available for Windows, Mac and Unix X Windows System with the first version appearing in March 1993. In fact, Netscape was code-named Mozilla (from Mosaic Killer), referring to the hope that the project would unseat the more popular Mosaic.

LASER

Contrary to the potrayal of lasers in many science fiction movies, a laser beam would not be visible (at least to the naked eye) in the near vacuum of space as there would be insufficient matter in the environment to make it visible. In case you didn't know: LASER stands for Light Amplification by Stimulated Emission of Radiation.

Liver

The liver is the only organ in our body, which can be partially removed and still function at a level to keep a human healthy. In fact, the liver re-grows itself over several months. It is now even possible for relatives to donate portions of their liver to a close relative, after which their own liver will re-grow.