Matter-antimatter annihilation? Yes, absolutely. As one starting point, see: https://en.wikipedia.org/wiki/Electron–positron_annihilation https://en.wikipedia.o

Matter-antimatter annihilation? Yes, absolutely. As one starting point, see: https://en.wikipedia.org/wiki/Electron–positron_annihilation https://en.wikipedia.org/wiki/Electron–positron_annihilation