The theory is simple: A single atom can reveal everything that has been, is now, and will be.
It is also wrong.
On first thought, this theory appears true. If every single property, such as position, velocity, etc., of an atom’s current state is known, the properties of all other atoms can be deduced, because for that observed atom to exist exactly as it did during the moment of examination, everything else had to occur in a specific and unique way.
Let us represent an atom with a numbered ball. Imagine that ball directly in the center of a box with his number facing up. Now begin placing other numbered balls in the box around our center ball, orienting them however you please. Remove all of those balls you just put in, leaving us with our still upward-facing center ball. Put the balls back in the box, using different orientations than before. Do this again and again and again until it becomes clear that there are an infinite number of ways you can do this. All the while, the center ball’s orientation never changes.
A single atom cannot be used to determine the state of the universe. Neither can two, or three, or four, or four thousand. The only way to determine the state of the universe would be to bring the state of every single atom into realization. The fact that this theory can be disproved is disappointing because it means that mankind will probably be forever in the dark about certain aspects of the world we live in.
On the bright side, if we ever did manage to observe and record every single atom, the Revealing Atom Theory could then be applied. The state of the atom would have to be constantly recorded and compared to the recorded data of all the other atoms, but it is possible.