To understand this conundrum, we have to go back to the very beginning: the first milliseconds of the Big Bang. As the early universe began to take shape, particles and their equal, yet opposite, counterparts — called antiparticles — annihilated each other and disappeared.
Both were supposed to have been created in equal amounts, so when everything finally settled down, nothing should have been left over. But a tiny portion of matter managed to survive and formed everything we see in the universe today. But it made scientists wonder: What happened to all the antimatter?
http://www.nbc26.com/newsy/scientists-d ... ing-exists