Little Benny was looking depressed, so his fourth grade teacher, Miss Feldman, asked, ""What's the problem, Benny? I hope it's not homework again..."" ""Well, uh, yes it is, mam"" replied Little Benny. ""I made my homework paper into a paper airplane."" ""Benny, that wasn't a very bright thing to do,"" Miss Feldman said, ""but this once, I'll let you just unfold the paper and hand it in."" ""Oh, but it's worse than that..."" replied Little Benny, looking even sadder. ""You see, the plane was hij…