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BENJAMIN FRANKLIN.

Benjamin Franklin. Portrait of Benjamin Franklin (1706-90), American experimental scientist and statesman. Franklin helped draft the Declaration of Independence in 1776, and acted as an international diplomat. Through experimentation, Franklin proved the distinction between positive and negative charges, and showed that lightning is a form of electricity. He discovered the Atlantic Gulf Stream and suggested that ships use a thermometer to navigate it. Franklin also invented bifocal lenses and investigated how different colors absorb solar heat. (KEYSTONE/SCIENCE PHOTO/Science Source) === ===

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