Isaac Newton was not a pleasant man.

Stephen Hawking, A Briefer History of Time

Equations are more important to me, because politics is for the present, but an equation is something for eternity.

Albert Einstein

If constellations had been named in the 20th century, I suppose we would see bicycles.

Carl Sagan

Life is like riding a bicycle. To keep your balance you must keep moving.

Albert Einstein

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