Anti-particles and particles instantly annihilate each other on contact, so anti-particles cannot not exist in our world besides for brief moments. There's a t

Anti-particles and particles instantly annihilate each other on contact, so anti-particles cannot not exist in our world besides for brief moments. There's a theory that half of the universe is made of anti-particles (and the other half composed of regular particles). So you could say that the half we inhibit has few anti-particles in it. See: https://en.wikipedia.org/wiki/Annihilation https://en.wikipedia.org/wiki/Annihilation