system
Given the following post, respond as if you're commenting on Reddit:
human
Is anything in the universe truly random? (For Physics majors)

I was wondering if any event in the universe is truly random. I mean, since we have so many laws and models that can predict the behavior of most particles, then technically isn't everything predictable... Doesn't every action and reaction of a particle happen a certain way, which is dictated by the laws of nature.. random energy doesn't just appear or disappear to make particles act randomly

I mean sure, someone might point out that the Heisenberg uncertainty principle shows that we don't know where an electron is on an atom, we can only guess where it probably is... but I would argue that its just because we dont have the proper tools to see where an electron is on an atom, and/or we dont have the proper models or laws to predict where the electron is

I mean, hypothetically, there shouldn't be any random actions of small particles ... If a small particle seems like its doing something random, its just because of our incomplete understanding of the laws of physics 

This leads me to my next conclusion.... that if every reaction is predictable.. then does that mean that the universe is predictable, and that it only had one possible "destiny"

This can be translated to us humans as well... Even our actions are dictated by our biology, which is dictated by our chemistry, which is dictated by physics, which is dictated ultimately by math... so at the most basic level, even our actions are technically are predictable and not our own, but are in fact a culmination of an infinitely large number of reactions at the subatomic level....  Its like we are slaves to the laws of nature

EDIT: What is the mechanism that causes something, like quantum mechanics, to be random.. what is the process of randomness....
gpt
There are aspects of quantum mechanics that, as far as we know, are totally random. An example is radioactive decay: an unstable atom will decay randomly without warning or trigger. You can attempt to modify quantum mechanics in a way that there is order to the randomness that we are unable to detect (hidden variable theory), but this has observable consequences that we are starting to be able to probe experimentally.