Pendulums of different lengths display various waves. Very simple, yet hypnotic. Where can you buy something like this? -via reddit
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Now if they invent a way to get the food on your plate w/o having to use a utensil that someone else has touched, I'd be happier. Maybe health department could require patron who use buffets and salad bars to wear disposable gloves while handling the utensils. I'd pay an extra $1 a meal to have such a bit of sanitary protection.
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