#18 Paper airplanes would fly farther.

#17 Wouldn't fires burn bigger and faster, and pretty much get out of control?

some are weird, but has anybody else been thinking, how we can get tho Oxygen in such a short time out?

howtomars.de/files/htm/editorial/images/physics/img_weltraumputze.gif

Thanks guys, I'll find the exit on my own...