The physics behind invisibility cloaks and Romulan cloaking devices is out there and getting more interesting every day. Cloaking means making an object invisible to electromagnetic radiation. Scientists Che Ting Chan, Yun Lai, Huanyang Chen and Zhao-Qing Zhang of Hong Kong University of Science and Technology recently published a paper in Physical Review Letters where they talk about cloaking an object by putting the device near the object, and not enveloping it.
Of course the device has not yet been built, but in theory it can be done. Neat stuff!
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