Some objects float in water and other sink. But did you know that you can change whether something floats or sinks by adding a substance to the water? Let's try it and see! Pour water into a cup until ...

Coins are supposed to sink. When you toss ‘em in a fountain, they drop right down to the bottom, right? Not always. There’s a trick that can actually make metal coins float, and it’s totally ...

How much water do you need to keep a cruise ship afloat? Less than you’d think. Archimedes’ Paradox lets you float a huge object in just a gallon or two of water. (It also shows why you’d ...