## Applies to any system about which we have only partial knowledge.

## Entropy is simply the logarithm of multiplicity, in bits or nats.

## Zeroth Law is a quantitative theorem about uncertainty slopes (dS/dX) for any conserved randomly-shared quantity X!

## Reciprocal temperature is the uncertainty slope dS/dE with physical units such that Troom=1/40 eV/nat.

## Equipartition, equations of state, laws of mass action, and even fluctuations, all follow simply from multiplicities.

## Predicted heat flows are simply one’s best bet.

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