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What is Life?
If the ability to reproduce, respond to stimuli etc. is life, then computer animations are life also. It is a technological possibility that robots can be made to possess all the seven criteria of living things (reproduction, response to stimuli, respiration, locomotion, nutrition, growth, excretion) defined by biologists. But even so, even children do not say that they have life. It is clear that we cannot define life by means of an input (stimulus)-output (response) model or any public observables. All these are but the attributes of life, not its essence. Logicians tell us that if we can point out a set of attributes that no other things can have them all, then we have succeeded in defining it. But to be more accurate, we should only say that we are then able to single it out among all other things verbally, we still do not know what it is if we do not know it in the first place.
So, to know what life is, we must be able to tell what the essence of life is.
What is the Essence of Life ?
Life is the ability to the experience of senses, namely, to experience the senses of joy, beauty, love, various cognitive dimensions or their negative forms.
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