Do quantum fluctuations come from "nothing"? Hello, I have two questions regarding quantum fluctuations. Do the particle (and its' anti-particle) appear from nothing? I know it happens in a Quantum vacuum. But do the particles themselves appear from nothing? Where do they get their energy from, or do they violate the energy conservation law? Please be detailed about this. And, if a particle and anti-particle collide, shouldn't their collision produce energy instead of just annihilation? Thank you.