Given a text, write a compressed version of it in a single sentence.
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Question: The apparently mysterious second law of thermodynamics states that the entropy of a system is either constant or increases. The modern understanding of entropy can be stated roughly with the help of the concept of a 6N-dimensional phase space.

Answer: The 2nd law of thermodynamics states that entropy of a system is constant or it increases. Modern understanding can be stated with the help of a 6N-dimensional phase space.

Question: For a membership gift of just $15, you will receive a full year of the world's most beautiful nature magazine, NATIONAL WILDLIFE. With its spectacular, full-color photographs, compelling features and updates on the important work your membership helps us to accomplish, this award-winning publication alone is worth the modest gift!

Answer: For a membership of $15, you will gain a full year of the world's most beautiful nature magazine, National Wildlife, because you donation helps us achieve may wonderful things.

Question: For the past 20 years, attorney Richard M. Smith has helped senior citizens with their legal needs, free of charge.

Answer:
Attorney Richard M. Smith has helped senior citizens with legal needs for free.