Battling Helicopters: There's no better way to learn the mysteries of heavier-than-air flight than to spin up a few air hogs and have them shoot each other out of the sky—in your living room. Seriously, these things may be expensive but they're fun for everybody who doesn't catch one in the eye, and they're surprisingly durable. They come out of China under a few different brand names, so root around, and see if you can find a better deal. $170; Ages 8 and up [Amazon]















