Cast your pepper upon the waters

Trust me, this is about surface tension. You need a glass of water, a pepper grinder, and a tiny amount of detergent.

Take the glass of water. Sprinkle pepper all over the top of the water. Put several drops of detergent into the centre of the dish.

What happens to the pepper?

Is the same thing happening over the whole surface of the water, or is it just in the middle?

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