When I was a kid (about 10, 11, or so) I read up a lot on planes and aviation because I wanted to be a pilot someday. Also logged plenty of hours on Microsoft Flight Simulator. So I knew how airfoils worked and the physics principles involved, and decided to apply that knowledge to design my own paper airplanes.<p>What I came up with involved construction paper taped to a bendy straw. The main wing was folded (but not creased) into an airfoil shape and attached to the long bit of the bendy straw. The short bit had paper elevators and rudder attached. By bending the straw I could set the plane to fly straight when thrown, or to turn, climb, or dive. It all worked pretty much according to plan and was one of my prouder childhood play moments. My wife laughed when I told her this and said it sounded like something her brother might do (a high compliment, as her brother is brilliant).