Hi, I've a doubt! The principle says that we cannot find simultaneity the position and the momentum of a particle, I understand this because if I haven't understood bad it's because to find the position of a particle we need to trhow photons to it (and more and more) as much as we want to be precis and this changes its velocity. The one i don't understant is the one of time and energy. Why can't we find both exactly? Thanks!!!!