I think Sir Issac Newton’s 3 laws motion is the most important discovery ever made.  It describes how an object at rest stays at rest until a force acts upon it. It also says an object in motion stays in motion until a force acts upon it. A rocket is a good example for the third law that the fire is proppeling the rocket up. That’s why I think the three laws of motion is the most inportant discovery. What about you?