I was always wondering about this. I heard, read etc that matter and antimatter when in contact causes their annihilation. The dictionary say to reduce to utter ruin or nonexistence. The way I hear it when, describing matter/antimatter relationship as "nonexistence. My question is, how can this be? I never thought any thing actually can be nonexistence. Nothing is ever destroyed, just changes to a different state. As an example, a nuclear bomb. It changes from a solid material to an energy, i.e., radiation etc.