A new mechanics of physical objects with negative mass is proposed. Their properties are explained by the positive inertia of any body with a mass of any sign. Accordingly, the principle of equivalence of inert and gravitational masses has been adjusted. Particles of negative mass repel each other from bodies with a positive mass and attract each other, forming huge islands of negative matter. Such particles are called negaons. The energy and temperature of the negaons are negative.
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