<ul><li>Researchers have created self-propelling particle assemblies by combining the Cheerios effect and surface tension gradient.</li><li>The particles are 3D-printed and filled with ethanol, which disrupts the water's interface and triggers a flow.</li><li>The particles repel each other as the ethanol slowly leaks out, but attract again as it evaporates.</li><li>The design can be customized to control the particles' attractions and motility, making it useful for robotics and educational projects.</li></ul>

Active Cheerios Self-Propel

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