Want to snare a stealth bomber?use your Cellphone

摘要

Whoops! Phone signals may unmask a $40 billion flying secret. Driving home from work,you suddenly remember that a few of the T-ball kids are supposed to come over after the game. Should you pick up a couple of pizzas on your way? You pull out your cellular phone and call home to check. Eight miles above you, unseen and unheard, a B-2 stealth bomber is cruising along on a practice run. The pilot believes that even radar can't detect his plane, but he's wrong. That call you're making, along with thousands of other innocent cellphone conversations taking place all over town, has inadvertently unmasked the bomber—defeating stealth technology that cost $40 billion to develop.