The Sticky-Tape X-Ray Machine
Check out Wired.com's exhaustive Sticky-Tape X-Ray Machine coverage:
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When pulled apart, sticky tape generates electromagnetic waves through simple friction. Now, as reported this week in the journal Nature, UCLA's Carlos Camara and Juan Escobar have discovered that in a vacuum, sticky tape also sends out strong enough x-rays to image your finger. Check out their bizarre sticky tape unpeeler, and see the machine take an actual x-ray image of a finger.
