According to CPT Symmetry matter has reversed charge, spatial coordinates, and time. This includes gravity. So this means that antimatter would attract other antimatter and matter would attract other matter. The difference is when antimatter gets near matter. They repel each other. First, can someone explain what CPT is in layman's terms? What does it mean to have spatial coordinates reversed? For time, it does not mean time is reversed but direction is. Can someone explain this one anyway? If the cpt is reversed, why does antimatter repel matter? What is happening on a quantum level that causes it to repel?