Monopole magnets? Radiation pressure propulsion or resonant cavity drive (Emdrive) would be pretty nice if it could become convenient not only for micropropulsion, although I'll probably invest in antimatter stock when the time comes.

On topic: $4.71/U.S. gallon. The value of the USD has increased by close to 37% (compared to the Swedish krona) in the past few months. Interesting.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram