Hello everyone I'm new to these forums, I'm not from an English speaking country so I'll try to explain my self as clearly as possible. I have a question that has been troubling me for quite a while. Are there any fundamentally random occurrences in physics? in other words, Is there a phenomenon that its behavior is not calculable? and I don't mean calculable with today's technology or knowledge, I mean a phenomenon that has been proven to be completely random, or is thought to be, because if everything is calculable then only one thing can happen in the universe, right?