1. This is ordinary water, just traveling uphill of its own accord. See?
2. Here it is in slow motion.
The trick is that the surface is much hotter that the water’s boiling point, so a layer of vapour forms underneath the droplet letting it keep its shape. It’s called the Leidenfrost effect. Then the texture of the surface propels the droplets in one direction only.
3. Scientists at the University of Bath took advantage of this effect to make a maze that water droplets could navigate.
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