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Proved that static electricity and lightning were the same thing by tying a key to a kite during a thunderstorm
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Invented the electric relay. This could send electrical currents far distances
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Invented the electric motor; which is used in most electrical appliances today
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Invented the electric telegraph. A machine that could send messages far distances across wires
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Invented an incandescent light bulb that could be used up to 40 hours without burning out
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Built the first AC system
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Used the first large windmill to generate electricity in Cleveland, Ohio
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Built his first automobile, the quadricycle, to run on pure ethanol
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Used radioactive tracers to diagnose heart disease
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Invented first automatic refrigeration system for long-haul trucks
