So here's an idea of mine. Tell me what you think about it. If you look at a human they're made up of cells which are made up of organelles which are made up of macromolecules which are made up of molecules whic are made up of atoms, etc etc etc blah blah blah. In chemistry. Anytime something happens, there's always a 100% of a specific result. For example if you electrolyze water it becomes oxygen and hydrogen. That always happens unless there is something that prevents it from happening, in which case that factors into my idea too. Since our bodies are made up of only these chemicals then everything that happens inside of them is predetermined by the laws of chemistry, to every positron. Now think about the human brain, it too is made up of chemicals and atoms and molecules and electric impulses. Everything you think of, every decision you make, everything is determined by the chemicals and chemical reactions and electrical impulses etc. that happen. It's all cause and effect. So when you think about it, everything that happens in the entire universe could theoretically be predicted if it were possible to account for every little piece of matter. I could tell you what you're going to say next, I could know who I'm going to meet next, I could know how I'm going to die. Since all the universe is pretty much running on a clock, nothing can interrupt it. And if something did, that would only be considered part of the process and wouldn't be interruptive. That means the choices we make aren't really made by us. They were just a series of reactions happening in our brains due to positions and properties of particles of matter.