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For the first time in history a conviction has developed among those who can actually think more than a decade ahead that we are playing a global endgame. Humanity's grasp on the planet is not strong. It is growing weaker. Our population is too large for safety and comfort. Fresh water is growing short, the atmosphere and the seas are increasingly polluted as a result of what has transpired on the land. The climate is changing in ways unfavorable to life, except for microbes, jellyfish and fungi. For many species it is already fatal.

Pure knowledge is the ultimate emancipator. It equalizes people and sovereign states, erodes the archaic barriers of superstition and promises to lift the trajectory of cultural evolution. But I do not believe that it can change the ground rules of human behavior or alter the main course of history's predictable trajectory.

Ancient Mexico, like most forest-invested New World tropics, was deficient in the kind of large game that flourished on the plains of Africa and Asia. ...The situation was partially relieved by cannibalizing the victims of human sacrifice. ...The [ Aztec ] priesthood... sanctified it... immediately after their hearts had been cut out, the victims were systematically butchered like animals and their parts distributed and eaten.

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Piaget, who was originally trained as a biologist, views intellectual development as an interaction of an inherited genetic program with the environment. It is no coincidence that he calls this conception "genetic epistemology," in effect the study of the hereditary unfolding of understanding.

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Because of mathematical indeterminancy and the uncertainty principle, it may be a law of nature that no nervous system is capable of acquiring enough knowledge to significantly predict the future of any other intelligent system in detail. Nor can intelligent minds gain enough self-knowledge to know their own future, capture fate, and in this sense eliminate free will.