Are There Laws to the Universe?

If there are laws that govern how the universe works down to the atomic and particle level, does that mean that the universe is totally predictable? Because if it follows laws, then you know what it's going to do, right? That's exactly right. Yet. And a few hundred years ago, there was this growing realization that, while the universe does seem to be kind of explainable, doesn't that mean it's explainable on a microscopic scale? If everything is made out of tiny, little billiard balls,. can't you describe and predict what happens when ten to 26 billiard balls bump into each other? Or even if you can't describe it computationally, doesn't