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“The general struggle for existence of animate beings is not a struggle for raw materials â€� these, for organisms, are air, water and soil, all abundantly available â€� nor for energy which exists in plenty in any body in the form of heat, but a struggle for [negative] entropy, which becomes available through the transition of energy from the hot sun to the cold earth.”
― Ludwig Boltzmann, The Second Law of Thermodynamics

“It is the theory which decides what can be observed”
― Albert Einstein