Comment the question is not valid because (Score 1) 393
we don't know we are made of matter. What if what we call matter is in fact anti-matter ? Or to put it differently, if the universe was made of "antimatter" wouldn't we think we were made of matter and the definition of antimatter (positron etc.) would be the opposite of what's now? Isn't it just a matter (no pun intended) of definition ?