Fidgety Molecules: How Internal Order Changes Behavior
A drop of ink in a glass of water spreads out on its own. But if the ink were made of tiny motors, they wouldn't just spread: they'd crawl, jostle, and cluster into swarms. Such self-propelled particles are called active. You can assemble them into molecules like beads on a bracelet. And here's the surprise: the order of beads on the bracelet changes everything.