I would like to understand quantum mechanics and physics in general better. From what I understand, quantum mechanics basically says that at the smallest size of the universe there is particles or strings of which everything is made of, which jump around randomly, and unpredictably. Also from what I understand, basically every other thing other than quantum mechanics, is deterministic (if you could measure all the particles in a system you could calculate its state at any point in time). Questions: Does quantum mechanics have an effect on the laws of physics? Example: If you have several large pure titanium balls in and empty part of space and their exact masses are known, and all gravitational pulls are known, and they are shot from a canon toward each other, and the exact time they leave the cannon, exact location, exact speed and direction are known, it should be possible to calculate exactly where they will be at any time in the future, or would it be possible that quantum effects could theoretically cause them to end up in completely different places than you would expect? What exactly is the definition of a "quantum event"?