They're Invisible, Jim
There's a fascinating article over at Nature.com about invisibility shields and how they might be produced.That's not why I'm giving you this link, though:
http://www.nature.com/news/2005/050228/full/050228-1.html.
Here's why. Look at this excerpt from the article:
...the invisibility shield proposed by Alù and Engheta in a preprint on arXiv1 is more ambitious than this. It is a self-contained structure that would reduce visibility from all viewing angles. In that sense it would be more like the shielding used by the Romulans in the Star Trek episode "Balance of Terror" in 1966, which hid their spaceships at the push of a button.
Dude knows WAY too much about Star Trek.
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