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Tiny forces, big effects: How particle interactions control the flow of soft materials
- May 13, 2026 at 5:03 PM
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Sitting in a restaurant, you reach for the ketchup bottle, eyeing the basket of fries in front of you. You give the bottle a shake, then a tap. For a moment, nothing happens—the ketchup clings stubbornly to the glass. Then, all at once, it lets go and rushes out, sometimes in a steady stream, sometimes in a messy surge that threatens to flood the basket.
Originally published at Phys.org