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The World (n.) is for any scientific theory.
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The World (n.) is in the head of the transcendental ego, but this head is no longer properly in the world.
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World (n.) is precisely our unshakeable certainty that the world is and that I am in the middle of this world.
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The World (n.) is not made primarily of forces, chemicals, potential and kinetic energy, or electromagnetic fields. What comes first is always phenomena perceived by humans, since these provide the true basis for any scientific theory.
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The World (n.) must be lost by epoché in order to be regained by a universal self-examination.