Humans have invented six devices that combine to make work easier. These six simple machines are the wheel and axle, the lever, the inclined plane, the pulley, the screw and the wedge.
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2018
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- Why Do Firearm Injuries Drop During NRA Conventions?
- This Woman Is Her Own Twin: What Is Chimerism?
- Cosmic Dawn: Astronomers Find Fingerprints of Univ...
- America's Tallest Mountain Has a Serious Human Poo...
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