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Solving the problem of free restroom stalls
Bashny.Net
One of the problems of public toilets - to find a free booth. We have to pull the handle and hear in response to "busy" until you find an unlocked door. Café Diglas, located in Vienna, this question decided genius: transparent doors are made using silver halide. When current is applied, they completely miss the light, but once triggered latch, the charge is lost and molecules change position so that absorb light.
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