It's simple. It's called the dumbing down of America. My grade school science books explained Bernoulli’s principle back in the 60's and it really was not that hard of a concept to understand. Back when the rear windows of cars actually went all the way down I used to experiment with my hand all the time. And why do you have to lock a thread down just because you don't like what is being said? What ever happened to the free discussion of thoughts and ideas? No one being ugly here that I have seen, you can always hang out somewhere else. I agree with the OP I prefer to see my planes and spacecraft lift off the ground and not suck off.