It’s one of the greatest puzzles in physics. All the particles that make up the matter around us, such electrons and protons, have antimatter versions which are nearly identical, but with mirrored properties such as the opposite electric charge. When an antimatter and a matter particle meet, they annihilate in a flash of energy.
Click here for original story, Discovery sheds light on the great mystery of why the universe has less antimatter than matter
Source: Phys.org