A birds wing.

In 1700 a man by the name of Daniel Bernoll did tests on bird wings and how they worked by taking the object under water.
He was able to do this because although water is much heaver than air it has much the same property as air.
He discovered that the way GOD made bird wings allowed the air to flow easily over the wing.
The air pressure above the wing is not as hard as the air pressure under the wing. And since the air pressure under the wing is harder and it pushes the wing up. And that is how birds are able to fly.
Years later the Orville and Wilbur Wright will invent a way for man to fly!!