Harry Potter and Captain Kirk would be proud. A team of American and British researchers has made a Cloak of Invisibility. Well, OK, it's not perfect. Yet. But it's a start, and it did a pretty good job of hiding a copper cylinder from microwave detection. Like light and radar waves, microwaves bounce off objects making them visible and creating a shadow, though it has to be detected with instruments. And if you can hide something from microwaves, you can hide it from radar - a possibility that will fascinate the military - and likely from eyesight as well. Cloaking...