Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
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"No great discovery was ever made without a bold guess."
"I shall not mingle conjectures with certainties."
"The light which comes from the sun, and from all fire, consists of all the primary colours mixed together."
"I build my philosophy upon the shoulders of giants."
"To explain all nature is too difficult a task for any one man or even for any one age."
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