Writer's Block: Practically amazing

[sparksol]

[Error: unknown template qotd]On the large scale, Some instant or high speed transport/mobility thing. Portal gun, teleporting, running so fast I can dash over the water for miles without getting tired. But then for that last one I'd also need a way to carry a bunch of stuff.

Smaller scale...hmm. Either never needing to fill the gas tank/battery/other power source for my vehicle, or never getting stuck in traffic or long red lights.