Thermodynamics states that in any closed system the entropy ALWAYS increases over time. I think this law works, but they need to stipulate that it's for situations where there is a begin-time and end-time (finite time range), but if you integrate entropy over all time (even in a closed system), you end up with a situation where the total area under the entropy curve is zero. In other words if you sort of 'remove' time from the equation, and only consider a closed system, then all particles are guaranteed to have had time to interact with each other and fall into a well ordered pattern where there is equal order and disorder. This is my belief and it is NOT the 'conventional' understanding, but people are beginning to adopt this idea into their thinking.

> Thermodynamics states that in any closed system the entropy ALWAYS increases over time.

You left out a bit. If we take Wikipedia's definition (I know, I know):

> The second law of thermodynamics states that the total entropy of an isolated system always increases over time, or remains constant in ideal cases where the system is in a steady state or undergoing a reversible process.

As far as is currently known the laws of physics are time-reversible, which (ISTM, at least) would imply that the latter clause could very easily apply to the universe as a whole.

(There's also the issue of whether the universe itself is a closed system.)

Yes I left out the part about steady state condition as well as absolute zero temperature condition, because those are boundary conditions (constant conditions) that don't involve time. My point is about an integral over all time.

And yes the definition of "universe" is something I define as "a closed system that doesn't interact with other systems", which is also a consistent definition even if the multiverse theory is correct. If two things interact then they are by definition in the same universe.