Sue asked:

How may entropy be reversed?

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Your question would be better directed to a physicist! However, the following is my understanding of
the concept of entropy:

The so-called 'law of entropy' is not a physical law but rather a mathematical theorem derived a priori
from probability theory. If you spill a bag of sugar on the floor it is possible, but extremely improbable,
that the crystals will spell your name. Randomly scattered crystals are in a lower 'state of entropy'
than crystals that spell out your name, or indeed crystals neatly packed together in a bag.

In the case of two bodies in contact which start off at different temperatures, there are immeasurably
many more ways in which the speeds of the random motions of molecules might even out compared
to ways in which the difference in the speed of motions might possibly increase. Hence, 'You can't
pass heat from a cooler body to a hotter body'. Not necessarily true, but rather a statement of
probability.

How might entropy be reversed? The assumption of the law of entropy is that we are dealing with
random processes. As soon as you introduce purposiveness or intentionality, the law no longer
applies. Every deliberate human action - even deliberately destructive actions - involves a reversal of
entropy. Order is created. Letters are formed on a page, spelling out meaningful words, or a stone is
aimed and thrown (with the result in this case that entropy is decreased somewhere else - a shattered
window).

Darwin's theory of evolution is a theory designed to explain how mechanically random processes can
give rise to structures which serve as entropy-decreasers.

Geoffrey Klempner