"Every body continues in its state of restm or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it." -- Sir Isaac Newton, First Law of Motion, in: Principia Mathematica (1687), translated by Andrew Mott (1729) "The alteration of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed." -- Sir Isaac Newton, Second Law of Motion, in: Principia Mathematica (1687), translated by Andrew Mott (1729) "To every action there is always opposed an equal reaction; or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts." -- Sir Isaac Newton, Third Law of Motion, in: Principia Mathematica (1687), translated by Andrew Mott (1729) "If I have seen further it is by standing on the shoulders of giants." -- Sir Isaac Newton, in letter to Robert Hooke, 5 February 1676 "I don't know what I may seem to the world, but as to myself, I seem to have been only like a boy playing on the sea-shore and diverting myself in now and then finding a smoother pebble or a prettier shell tthan ordinary, whilst the great ocean of truth lay all undiscovered before me." -- Sir Isaac Newton

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