Hairspray and air conditioners could reveal life on other worlds

If we can't get in contact directly with any of the aliens that might live on the Milky Way's billions and billions of planets, then the next best option is to look for evidence that they have reshaped their worlds. And silly as it might sound, our best hope is that aliens use hairspray and central air. » 11/23/12 3:30pm 11/23/12 3:30pm