Who discovered how to make antimatter?
Antimatter is essentially the opposite of matter. Just as matter is made of protons, neutrons, and electrons, antimatter is composed of antiprotons, antineutrons, and antielectrons. It is impossible for matter to be created without antimatter, just as you cannot cut a shape out of a piece of paper without leaving a hole of the same shape in that piece of paper. For the sake of this particular analogy, the shape would be matter, and the hole would be considered antimatter.