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At The National Portrait Gallery: Rittenhouse

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  The Self-Made Man David Rittenhouse (1732-1796)  was a world renowned astronomer, scientist, mathematician, surveyor and inventor. He was also entirely self-taught. Rittenhouse grew up near Germantown, PA.  It is said that at age 13 he had mastered Newton's laws of motion and gravity.  He was one of the first Americans to build a telescope and […]