How did matter come to be?
Why is there matter if matter and antimatter cancel each other?
Actually, I also believe that before anything should have come into existence nothing should have been in existence. So everything should have got created out of nothing as we get +ve numbers and -ve numbers from zero as follows. 0 => + 4 - 4 or 0 => +5 - 3 - 2 Wherein, the +ve numbers represent the matter and the -ve numbers represent antimatter. Of course though splitting of zero can be explained but how we explain it in physics is an unresolved mystery.