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"Democritus." (Stanford Encyclopedia of Philosophy). N.p., n.d. Web. 18 Dec. 2012.
"Democritus." Wikipedia. Wikimedia Foundation, 16 Dec. 2012. Web. 18 Dec. 2012.
"Ernest Rutherford." N.p., n.d. Web.
"J. J. Thomson." Wikipedia. Wikimedia Foundation, 18 Dec. 2012. Web. 18 Dec. 2012.
"James Chadwick." Nobel Prize. N.p., n.d. Web.
"John Dalton Biography." Bio.com. A&E Networks Television, n.d. Web. 18 Dec. 2012.
"Louis De Broglie." N.p., n.d. Web.
"Niels Bohr." N.p., n.d. Web.
"Robert Millikan." Wikipedia. Wikimedia Foundation, 12 Dec. 2012. Web. 18 Dec. 2012.
"Werner Heisenberg." Nobel Prize. N.p., n.d. Web.