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If you point a hair dryer up and switch on the air,
Now drop a table tennis ball into the rushing air flow. The ball hovers and spins, it stays right up there. This is called Bernoulli's principle, you know. You can produce this effect several different ways.
Switch on a large fan and drop in a beach ball. Like before, it hovers around. It doesn't blow off, it stays! Still there are more ways, this is not all. Try a flexible straw with a table tennis ball or small balloon.
Foil balls work well, but are the trickiest to get going. This way is the hardest to do, but with practice you should master it soon. Balloons are light and easy. They hover long and high with only light blowing. Buy a mini-fan from a local drug store.
Blow up small balloons; be sure to take down the knot. Another portable Bernoulli blower, this is method number four. Display it in the car. A window science show is what you've got. --Will Bortz
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