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Tangle-web spiders are amazing weight-lifting engineers. They can snag prey 50 times heavier than themselves, like lizards and small mammals, using pulleys of stretchy silk. Spiders weave their own ...

A pulley is a simple machine using a wheel and a cord that's designed for lifting. A pulley is a simple machine using a wheel and a cord that's designed for lifting. Pulleys help make work easier by ...

Explains how pulleys work to lift heavy weights more easily. A fixed pulley changes the direction of force, allowing for easier lifting, while a movable pulley reduces the amount of force needed to ...