Shark teeth: The sharp bits of a squishy animal
Brains On! Science podcast for kids
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Why Does Steam Travel Up Instead of Down?
Why does steam travel up rather than down? Steam rises instead of falls, because it's lighter than the air surrounding it. Density is how much stuff you have compared to how much space that stuff takes up. The only way to get those substances to move around on the station is to actually have fans and to force the air to move.
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