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“Walkers” Go Super

Without context, you might think a “superwalker” is an extra-fast power walker, topnotch zombie, or even a high-tech mobility device. But this is a physics blog, so that’s your first clue that we’re headed in a different direction. The superwalkers in this story don’t even have legs—they are small drops of liquid with surprising capabilities that were serendipitously discovered by researchers at Monash University in Australia.

Before we get into the details of superwalkers, let’s start with regular walkers. About 15 years ago, researchers discovered that if you vibrate a small, open container of liquid in the right way and under the right conditions, a droplet of the same liquid will “walk” horizontally across the liquid surface.

Sáenz, et alSpin lattices of walking dropletsAPS Gallery of Fluid Motion
When a droplet hits the liquid for the first time, it bounces upward and creates waves in the liquid. When it falls back down again, the droplet interacts with the waves it created p…
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