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    Christopher Chyba and Carl Sagan's own work acknowledges ... — Carmelics
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    Supports→NASA's definition of life as 'a self-sustaining chemical system capable of Darwinian evolution' is implausible.

    Christopher Chyba and Carl Sagan's own work acknowledges that operational definitions of life must apply to individuals, revealing an internal tension in the NASA framework.

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    knowledge(Distinguished from mere true belief, which may be the product of indoctrination and need not exercise deliberative capacities.)
    Justified true belief — true belief that has been arrived at through the exercise of deliberative capacities, including comparison of and deliberation among alternatives.

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