The Bernoulli Effect:
The top of the wing is curved, so that the air that is moving over it has less pressure, moves faster, and moves further. The bottom of the wing is flat so that it has more pressure, moves slower than the air above it, and pushes up harder than air above the airfoil.
The Newtonian Theory: The air on the top has more pressure than the bottom, and it tried to move further. On the bottom of the wing, the air hits the wing, then it bounces back off.
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