Question

Hello Michi. I didn’t understand why, according to quantum theory, there is randomness in the world. When light is a wave, you can’t say where it is, but when you check the position its function collapses, and you can know the position probabilistically. But if it’s probabilistic, then it isn’t random, because if it were truly random we also wouldn’t have probability for it (correct me if I’m wrong). So where / is there randomness in the world?