Liquids rise or absorb through tiny holes and gaps in some materials, a process is known as capillary action or capillarity. Because they have pores and are permeable, paper towels allow both liquid and air to pass through their small spaces.
To help them stay above water, water striders rely on the water's high surface tension and their long, hydrophobic legs. With their specially adapted legs and evenly distributed weight, water striders take advantage of this surface tension.
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