Antigravity propulsion and levitation is not science fiction. The Biefeld-Brown Effect is very easy to demonstrate at home by building a Lifter with just a couple bucks worh of parts and an old computer monitor. This is, BTW, a great science fair project for the kids.
Check the following links (of many that can be found on Google):
http://jnaudin.free.fr/html/bbracer.htm
http://www.americanantigravity.com/technology.html