Sometimes the most interesting science is right in front of us. Namely, why do the last bits of breakfast cereal cling together on the milk's surface?
Key Facts In This Video
If you drop a styrofoam ball in the center of a glass of water, it immediately tries to travel toward the edge. 00:22
Water molecules attract each other more than they attract air molecules. This causes surface tension, an effect that makes water behave as if the surface is covered by a membrane. 00:42
In a completely full glass, the surface is convex, so the balls move toward the highest point -- the center. In a partially filled glass, the concave surface's highest points are at the edges, which is why the balls move there. 01:45
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