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How Hertha Ayrton explained ripples in beach sand

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When she wasn’t fighting for women’s right to vote or literally dodging police, Hertha Ayrton was obsessively boiling water in glass tanks to study sand. She single-handedly figured out the fluid instability mechanics of why waves create perfectly uniform ripples on the beach, shutting up every male physicist who thought it was just plain water friction.

How Hertha Ayrton explained ripples in beach sand
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