You need:
-1 dish or petri-dish of water
-a little bit of talcum powder
-a few drops of dish-detergent
Steps:
1. Sprinkle some talcum powder over the surface of the bowl of water. The talc will settle on the water surface like this:
2. Now drip two to three drops of detergent into the middle fof the bowl and watch.
3. The detergent reduces the water's pulling power near where it lands. As a result, the talc is pulled outwards by the water with greater pulling power and even sinks to the bottom:
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