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Phantastic Physics Demos: The Card Blow

A great proof of Bernoulli's principle is to fold an index card so that about a cm on both ends has been folded at a right angle to the rest of the card.  Next, place the card on a flat surface with the folded parts facing down.  Now challenge someone to blow the card off the table by blowing under the card.  The harder the person blows under the card the more the card sits there. It even bends down closer to the surface as air passes underneath the card.  Once again the experience gets explained in terms of Bernoulli's principle...

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