Generally, tanks are not designed with the ability to fly, much less the ability to fall through the air from a couple thousand feet up and land safely. You can strap a bunch of parachutes to them and hope for the best, but a much more effective (and much more awesome) way to do it is to use rockets instead. Just ask the Russians.

We all want jetpacks, but the only way they'll ever be affordable is if they're good for something besides being a plot device for James Bond movies. Martin Aircraft, the guys who have one of the few commercially available jetpacks in existence, have some thoughts about why these things might actually make sense.

The Marines' version of Lockheed Martin's F-35 can take off, hover in mid-air, and land vertically. But it's not a helicopter, it's a supersonic jet fighter, albeit one with some absolutely unreal capabilities.

When it comes to aircraft, bigger is better. As size increases, so does efficiency, which is the thinking behind the monstrous Airbus A-380. But to be really efficient, you'd need to go bigger. Way bigger. We're talking an aircraft so large that other aircraft could land on it, in-flight.