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John Hudson Tiner Biography

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“For five years Isaac had been working eighteen hours a day.”

Book:Isaac Newton: Inventor, Scientist, and Teacher

Source: Isaac Newton: Inventor, Scientist, and Teacher

“During the eighteen months that followed Halley's visit, Isaac worked day and night on the book. He didn't mind the sacrifice. A living, growing thing took shape before his eyes. Never mind that he ate irregularly. Never mind if he kept at it eighteen hours a day. The book would be worth all the effort.”

Book:Isaac Newton: Inventor, Scientist, and Teacher

Source: Isaac Newton: Inventor, Scientist, and Teacher