Isaac Newton, was an English mathematician, who discovered "The invisible force of motion." That we call "gravity". He also discovered the 3 laws of motion. Which contain: The 1st Law- Net external force, the 2nd Law- Acceleration with the body, and the 3rd law- For every reaction, has a opposite. If it weren't for that apple falling and Isaac's curious mind, I'm not so sure we would be where we are in technological or scientific advances, today.
Isaac Newton, gets hit with an appleon the top of his head.
Newton, has a theory of an invisible force of motion (gravity).