"[H]ow can an electron with negative electrical charge emerge from the energy in a puff of light, which has no... charge? This is where nature's two forms of matter enter the story. The negatively charged electron has a positively charged form... the . The energy of a photon, a particle of light, becomes trapped in these two complementary pieces of substance. This... can also happen in reverse: an electron and a positron can annihilate one another, their individual energies being taken by the photons that rush from the scene of destruction at the speed of light. The emergence of substance from pure energy... is almost biblical in scope. With antimatter... we make contact with the gods of creation."