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For Aristotle, this motion was therefore fulfilling the “nature” of the animal, just as its natural growth fulfilled the nature of the animal.
Aristotle often refuted an opposing argument by showing that it led to an absurd conclusion, this is called reductio ad absurdum (reducing something to absurdity).
In other words, he single-handedly invented science as the collective, organized enterprise it is today.
Plato’s Academy had the equivalent of a university mathematics department, Aristotle had the first science department, truly excellent in biology, but, as we shall see, a little weak in physics.
He suggested that the motion of such inanimate objects could be understood by postulating that elements So earth moves downwards most strongly, water flows downwards too, but not so strongly, since a stone will fall through water.
In contrast, air moves up (bubbles in water), and fire goes upwards most strongly of all, since it shoots upward through air.The surprising thing is, in view of Aristotle’s painstaking observations of so many things, he didn’t check out these rules in any serious way.