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Thomas Jefferson (April 13, 1743 – July 4, 1826) was an American statesman, diplomat, lawyer, architect, philosopher, and Founding Father who served as the third...

Theodore Roosevelt Jr. (October 27, 1858 – January 6, 1919), often referred to as Teddy Roosevelt or his initials T. R., was an American statesman,...

René Descartes (31 March 1596 – 11 February 1650) was a French-born philosopher, mathematician, and scientist. Descartes was a late riser. The French philosopher liked...