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

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?

3) Who among the following invented the small pox vaccine?

4) What Benjamin Franklin invented?

5) Which scientist discovered the radioactive element radium?