Why Paper Airplanes Fly

I know that the real planes fly because of its curved wings. However, paper airplanes don't have such curved wings. How can it fly? Where does the lifting force come from?

Well, speaking as someone who sprained his back lifting shuttle documentation-everybody knows an airplane flies when the weight of its documentation equals or exceeds the weight of the airplane. Therefore a paper airplane flies because it's self-documenting.

The Galileo probe, however, was the first spacecraft to be outweighed by its own *environmental impact report*, according to the people I talked to at JPL this winter. (The EIR was ~ 1 million pages; it made me wonder if they'd chopped down enough trees to require a meta-EIR.)