Comment Yes But Not Discover--Rather Define. (Score 1) 83
The argument of whether or not a virus is alive or a paramecium, for example, is absurd.
It's not something that is or isn't, it's how do you want to use the word?
To me, this calls for either multiple words or one word with types thereof or with parameters (my preference).
Biologists might say life is an autonomous entity that replicates itself with a small number of mutations.
This makes sense in terms of evolutionary life, of course.
Still, you have to ask what constitutes an "entity"--perhaps a set of spatially correlated components and perhaps add adjacency where the majority remains correlated between adjacent moments.
However, I feel a broader definition might better be an autonomous entity driven by value judgments through learning.
The entity, in this case, must be virtually correlated elements but otherwise the same as for evolutionary life above.
Being driven by value judgments through learning differentiates from a mere machine that is driven by logical/mechanical rules.
Life in this regard might not be evolutionary but has intrinsic free will and intelligence through learning to balance what is likely against what is desirable.
Free Will, in this context, is exploration for the derivation of options and the ability to weight them against each other (based on likelihood multiplied by efficacy).
Desirability here is the sum of likelihoods multiplied by efficacy along a path of options. A donut has high positive efficacy but walking through cold rain to get it has negative efficacy. The likelihood is high if the weatherforcast is bad and you know the donut shop is open. So desirability is efficacy of cold rain (say -23) multiplied by trust in weather forcast + efficacy of eating donut (say +80) multiplied by trust that the donut shop is actually open.
This broader definition of life not necessarily evolutionary is useful not only in that it can include some forms of AI agents but also hypothetical entities in the natural world that are non-evolutionary or not comprised of adjacent components--say a gas cloud entity or one made of a set of non-adjacent stars. This seems unlikely but what if we found such a thing? It would be relevant and fascinating. It could be that some class of such thing exists and operates and we have been completely unaware. Maybe it lives backwards through time instead of forward? Maybe the chaos of the universe from the Big Bang has patterns that unify such an entity across spacetime in some unique way. Chaos theory does allow for such possibilities. I am not claiming to know of any but arguing we have no reason to close the door on the possibilities.
Of more importance to me, however, is the difference between life and a mere machine. A mere machine being driven by logic/mechanics has no intent of its own. It has no desire or aims. It merely reacts to rules. It is mindless. However, an agent driven by value-judgments has intent and desire. It chooses the most preferable path forward that is itself a literal belief (more or less) that it will achieve or avoid a certain outcome. If, however, environmental conditions lead to an inability to find such paths (predictable and preferable--inability to weigh them against each other) then it has no freedom and therefore no life. In layman terms, if you have no choices or no way to guess which choice is better than another then you have no cause for doing anything and you will mentally die. Or, you will mentally die if your challenges are either too hard or too easy. Life is about learning and making value-judgments based on that learning. That is not biological life but it is the life of a mind.
Sure, a mind is also build on a machine but it is more than a mere machine.