Scientists think that your brain holds all your memorys, but theres people that live perfectly fine with peices of there brain missing, no memory problems... no nothing. Humans have a soul, even though you cant see it, and the law is, energy just cant diserpire, so what happens to all so your soul? That reborn thing, is that if you live your life good, the better next on will be, if you waste it and treat like c--p, you'll have a s--t next life, so maybe if we did know what happens, and it was that, the world would be a whole lot better place.