History books will all claim that it was the Wright brothers that basically invented heavier-than-air flight. The history books are all wrong. Humans really aren't that clever. Aircraft weren't created - they were discovered. In fact, we have no idea how planes work. They just hatch from giant sky eggs, laid by bigger mommy planes, and we have to tame them before we can put them into regular service.
Didn't find that joke funny? Well, how about some actual facts then. This picture isn't, in fact, an FA-18 Hornet just emerging from its egg. The cloud is actually what happens when an aircraft reaches supersonic speed (i.e. faster than the speed of sound), and the expanding supersonic boom it leaves in its wake compresses the moist air, forming a spherical cloud. There you go. The first explanation was way more fun, wasn't it?