“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*

*Newton’s Third Law, quoted from Newton’s Principia - The Mathematical Principles of Natural Philosophy (Newton 1687/1848, p. 83).

*Newton’s Third Law, quoted from Newton’s Principia - The Mathematical Principles of Natural Philosophy (Newton 1687/1848, p. 83).

Newton, I. (1848). The Mathematical Principles of Natural Philosophy. Daniel Adee. (Original work published 1687).