Classical to Quantum

Our intuitions are tuned to classical physics--the collection of physical laws and equations that govern the behavior of ordinary objects. For example, your car keys typically stay right where you put them an hour ago and don't reappear in the refrigerator. It's possible to plan an outfit the night before because your clothes don't change color in the closet. And, notwithstanding the batter, a well-pitched baseball usually arrives at the catcher's mitt and not in another stadium. The world of classical physics is predictable to an incredible degree: If you know the initial location and speed of an object, as well as the forces that act on it, you can predict its future motion with near-perfect certainty. That's how NASA can place a spacecraft at a precise location a billion kilometers away.