Everyone's heard about why airplane wings are flat-on-the-bottom-and-curved-on-top, but actually things are much weirder when it comes to generating lift.
Check out these ground effect airplanes that don't fly very high but can lift tons (literally).
And besides, the reason that you were probably told about why airfoils work was probably wrong. At least according to Jef Raskin.
In his article, Raskin mentions a famous book called The Physics of Baseball. You can see more information here.