According to what I've read in popular accounts of modern physics, cause, effect, contingency, necessity etc. all disappear at the quantum level, where things pop into and out of existence with no prior cause, the cause and effect that we see at the everyday level being statistical, not absolute. Furthermore, the big bang, in its ultimate origin, was a quantum event. Therefore, may it not be that the universe just popped into existence for no reason? I dare say I've completely misunderstood the science, so I post under correction.