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All observations are liable to error; no telescope is perfect, no leveling instrument entirely trustworthy; no instrumental graduations are exact and no observer is infallible.
Horace H. Hayden
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Slumber not in the tents of your fathers. The world is advancing.
Giuseppe Mazzini
Horace H. Hayden
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Born:
October 13, 1769
Died:
January 25, 1844
(aged 74)
Bio:
Horace Henry Hayden D.D.S. was the first licensed American dentist and dentistry school founder.
Horace H. Hayden on Wikipedia
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