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Looking for ways to liven up your next quantum physics party? Shine a light through a polarized lens. Align and rotate a 2nd lens until the light intensity is reduced to 50%. Align and rotate a 3rd lens until the light intensity is reduced to 25%. Next ask your guests what will happen to the light intensity if you remove the 2nd lens. Have accomplice standing by with camcorder to record audience reaction when you remove the 2nd lens.