Although not quite like Harry Potter's invisibility cloak, we're getting there: scientists have "developed a method to make objects 'invisible' within a limited range of light waves."
In their experiment, the physicists covered a cylinder about a foot long and an inch or so in diameter with the material. Microwave detectors could no longer plainly 'see' it, although it was still visible to the human eye. But the same principle could be transferred to the range of perceptible light, researchers say.
Doing so would then make objects invisible to the human eye.
The effect only covers a very small band of electromagnetic waves at one time, and in the visible range of light, it would only work on objects much thinner than a single strand of hair.
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