The things we can observe about the universe tell us that it is non-deterministic. You have to assume things we haven't been able to observe to construct our u

The things we can observe about the universe tell us that it is non-deterministic. You have to assume things we haven't been able to observe to construct our universe as deterministic. And it is pretty simple things such as radioactive decay of a single atom in a vacuum which are pretty easy to grasp.