Windows and mirrors embedded with liquid crystals can hide images that appear only when the right kind of light is shined on them. The technique, inspired by a 4000-year-old trick for building “magic ...
Many people distinctly remember the Evil Queen in Disney's 1937 film "Snow White and the Seven Dwarfs," saying, "Mirror, mirror on the wall." However, the actual line in the movie is, "Magic mirror on ...
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