I heard that for one baryon there are 10^9 photons exists in this universe..i want to know how did they calculate? is there any theory which solves baryon asymmetry with satisfaction Or is it still a mystery? why there should be equal number of matter and antimatter? is it to make the total electric charge of universe to zero? if so,then we should also do this for all conservation laws and say that energy,momentum etc..are also zero...and if everything is zero,then how we came to existence and this pushes me to ask a question ARE WE(UNIVERSE) REAL?