From Slashdot: Sticky Tape Found To Emit Terahertz Radiation.  Reading through the comments, this is more of an interesting curiosity than a practical discovery, but I find the explanation fascinating.  Terahertz-range radiation can be used for imaging, like C-rays.  Denser objects absorb more of the energy, so looking at the “shadow” from the other side of the object can show hidden weapons, etc.  Unlike C-rays, though, terahertz-range radiation does not harm the body.

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