I have read the theory about uncertainty and cannot quite grasp it. Why is it that we cannot measure the speed of an electron and its location at the same time? As I understand it, the reason for probablility waves is because we cannot measure speed without disrupting where the electron is, or we can't observe where it is without disrupting its velocity? Something like that I think. Or does the electron literally dissapear and reappear in a different location? I'm quite confused. Any help would be awesome. Thanks!