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Pulley systems were invented because humans hate lifting and love shortcuts.

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🤯 "Pulley systems were invented because humans hate lifting and love shortcuts."

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A black hole’s event horizon is the boundary beyond which nothing escapes. A gyroscope resists changes to its axis of rotation. A laser works by amplifying light using stimulated emission. A light-year is the distance light travels in one year: about 9.46 trillion km. A photon has no mass but carries energy. A photon is a quantum of light. See all Physics facts →

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