Walking on water

Scientists explain why a liquid can sometimes act like a solid

By Stephen Ornes, 17:23 PM July 30, 2012

Almost anyone can tell the difference between a liquid and a solid. A liquid flows. A solid stays put. You pour a liquid and push a solid. The difference seems as clear as water and ice.

But some stuff doesn't fit neatly into either group, like the goop you get by dissolving cornstarch in water. (Cornstarch is corn flour that helps thicken pie fillings and gravies.) The concoction looks like a liquid, and can be stirred gently with your hand or a spoon. But appearances are deceiving: Fill...

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