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Most leaves are coated in a waxy, waterproof substance that renders them hydrophobic, meaning that they repel water.

Some leaves go even further with small bumps called papillae, too small to be seen by the naked eye. The papillae effectively trap bubbles of air, which the water can not displace, and that causes the water to roll off without making contact with the leaf. Think of it kind of like a hovercraft, which uses a pocked of contained air to keep itself above the water, but in reverse.

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Michael Scalise

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3y ago

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