But that is not the point of the story today.
One nice demonstration of Bernoulli's principle is simply holding two strips of paper side by side about an inch apart, then trying to blow them away from each other by blowing in between them.
One of my test questions was this:
The students were allowed to do it during the test, and I was willing to model during the test.
If you blow between two sheets of paper, what is most likely to happen?
a. The sheets move apart.
b. The sheets move together.
c. It cannot be predict
I had one student in my class Fernando, a peripheral member of the Wackadoodle Club, properly do the demo. The papers clung together. He did it again. I smile and nodded. He asked me if it was a trick question. No, Fernando, it's not. He did it again. And again. And again.
He was getting more and more agitated each time he did it. I finally told him to pick the answer that reflected what he saw.
He got it wrong.
I asked him the next day what happened? And he looked upset--"I know what I saw, but what I saw couldn't be right, so I picked "a"--I thought I was doing something wrong."