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Every few years, the tires on your car wear thin and need to be replaced. But where does that lost tire material go?
Air rings blown by dolphins swimming underwater and rings of smoke emitted by jet engines are just two examples of vortex rings. These doughnut-shaped structures and their mesmerizing movement have ...
Inspired by musical instruments and the fog-drinking power of California redwoods, which get about 35% of their annual water ...
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