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By selecting and growing those few species of plants and animals that we can eat, so that they constitute 90 percent rather than 0.1 percent of the biomass on an acre of land, we obtain far more edible calories per acre. As a result, one acre can feed many more herders and farmers— typically, 10 to 100 times more—than hunter-gatherers. That strength of brute numbers was the first of many military advantages that food-producing tribes gained over hunter-gatherer tribes.

Jared M. Diamond - Guns, Germs and Steel

1999, W. W. Norton & Company

In quantum mechanics, the Hamiltonian of a system is an operator corresponding to the total energy of that system, including both kinetic energy and potential energy. Its spectrum, the system's energy spectrum or its set of energy eigenvalues, is the set of possible outcomes obtainable from a measurement of the system's total energy. Due to its close relation to the energy spectrum and time-evolution of a system, it is of fundamental importance in most formulations of quantum theory.

Hamiltonian (Quantum Mechanics) - Wikipedia

en.wikipedia.org

The so-called instinct of causality is nothing more than the fear of the unfamiliar, and the attempt at finding something in it which is already known.—It is not a search for causes, but for the familiar.

The Will to Power

Friedrich Wilhelm Nietzsche

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