Thallion - Are you sure that is the only difference between matter and antimatter?<br /><br />I thought it also had an opposite spin?<br /><br />I agree that the energy from antimatter is positive - that is why antimatter - matter collision results in added energy, the Energy equivalent of both masses, both antimatter mass and matter mass.<br /><br />Avery - That is true about math. Try, however, expressing your math statement in words rather than numbers.<br /><br />Minus would be subtracting mass.<br /><br />Now try factoring in a negative to give a positive.<br /><br />Say you have 100 amu, atomic mass units.<br /><br />Now, say you have 200 amu minus 100 amu = 100 amu.<br /><br />Now convert energy separately. Say e in the formula e=mc^2 is 100 au (in this specific example).<br /><br />The energy which results would be the energy of 200 amu minus the energy of 100 amu.<br /><br />So we have 2e=2mc^2 plus -1e=-1mc^2 yielding e=mc^2<br /><br />Now, if -1e yields negative energy, rather than positive energy, the result would be 2 mc^2 minus a negative energy, or minus a minus.<br /><br />The result would then be a plus, or 3mc^2.<br /><br />See the problem?<br /><br />The only way the solution is correct is because the negative is simply a negative amount of positive energy, not a negative amount of negative energy.