This statesman, politican, scholar, inventor, and one of early presidents of USA

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This statesman, politican, scholar, inventor, and one of early presidents of USA invented the swivel chair, the spherical sundial, the moldboard plow, and the cipher wheel.

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1) Until Victorian times, chocolate was thought of as a drink. When did the first chocolate bar appear?

2) When were blue jeans invented?

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4) What Benjamin Franklin invented?

5) Which scientist discovered the radioactive element radium?

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