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How to sign: a natural phenomenon involving the physics of matter and energy
Categories: natural phenomenon
Within this category: acoustic phenomenon, atmospheric phenomenon, boundary layer, chaos, cloud, conduction, decalescence, electrical phenomenon, electricity, energy, event, field, flotation, force, hysteresis, interaction, mechanical phenomenon, opacity, optical phenomenon, power, pressure, propagation, reflection, refraction, resolution, resolving power, resonance, surface tension, syzygy, transparency, turbulence