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I agree that living/not living will be a somewhat useless concept in the future.
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I do not know who you are agreeing with but the above statement is curious to a high degree. You are implying that at present living/not living is a useful concept but that at some point in the future this distinction will become useless. Science aside, I wonder what the legal communities response to this concept will be.
Are you a living being? How do you know?
Most observable matter on earth is in either of three states: gas, liquid or solid,( man in a laboratory can produce different states also, plasma and Bose-Einstein condensate etc) and in the universe as a whole more exotic states of matter do exist.
States of Matter
-Zeno