For the laboratory some students put a strip of shiny metal into a beaker of blue solution and then stored the beaker on a shelf
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<em>The next time you wake in the middle of the night and need to make a trip to the kitchen or the restroom, cover one of your eyes with your hand before turning on any lights. You'll save the night vision (a.k.a. Sharingan) in that eye. The effect is trippy.</em>