Pepper Scatter
This classic science trick is guaranteed to make you go "oooooooh!" and comes with my "no oooooh, no charge" money back guarantee.
How To Do It
1. Pour enough water into a shallow dinner plate to just cover the bottom - you don't need more. Sprinkle fine ground black pepper on the water.  | |
2. The water will look something like this.  | |
3. Dip a clean toothpick into the water so it touches the bottom of the plate. Nothing happens... whoopy.  | |
4. Now dip the toothpick into detergent and touch the bottom of the plate again. Wowsers! This time, the pepper scatters away toward the edges of the plate in every direction. Cool!  Note: you need fresh water to do the trick again - when you're finished, pour leftover water into a bucket and use it to water a plant (please don't waste water) |
ANSWER:
The motion results from the reduction in the water's surface tension when detergent is added.
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