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This experiment involves balancing a hammer, a ruler, and some string. It is one of those balancing tricks that seem as though they just should not work, even though you understand the science behind them. I first learned it when I was eight years old, but it is still one of my favorites.
I took this photo at the beach. Looking at the tire tracks made me think about why car tires have treads, instead of being smooth, like racing tires. Why?
