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To cut a water droplet in half, you just need a knife made from hydrophobic (water-repellent) materials and a hydrophobi…
To cut a water droplet in half, you just need a knife made from hydrophobic (water-repellent) materials and a hydrophobic surface. The hydrophobic properties prevent the water from sticking to the knife or surface, allowing the droplet to be neatly split into two.