Antimatter Is Starting to Yield Its Secrets

Is antimatter just like matter, but, well, opposite? This question has bedeviled physicists for decades. Antimatter is very similar to matter --it's made up of subatomic particles juts like matter is, but they have an opposite electric charge. So an antimatter electron has a positive charge and is called a positron (a "normal" matter* electron has a negative charge). An antimatter proton has a negative charge, and though I really wish they were called negatrons instead they're just called antipr...