¹ Weisstein, E. "Franklin, Benjamin (1706-1790)." Wolfram Research, from http://scienceworld.wolfram.com/biography/FranklinBenjamin.html.

² Leo Lamay, J. The Life of Benjamin Franklin, Vol. 3. Philadelphia: University of Pennsylvania Press, 2006, pp. 69.

³ Pettigrew, J. "Electroreception in Monotremes." The Journal of Experimental Biology 202 (1999): 1447-1454.

⁴ Mora, C. V., et al. "Magnetoreception and its trigeminal mediation in the homing pigeon." Nature 432 (2004): 508-511.

⁵ “The Large Hadron Collider.” CERN. http://home.web.cern.ch/about/accelerators/large-hadron-collider

⁶ Brain, Marshall. “How Television Works.” About.com http://electronics.howstuffworks.com/tv. htm

⁷ “betatron.'' Encyclopaedia Britannica. http://www.britannica.com/EBchecked/topic/63352/betatron

⁸ “Physics in the 1940s: The Betatron.'' University of Illinois at Urbana-Champaign. http://physics.illinois.edu/history/Betatron.asp

⁹ Powell, D. “Mysterious Monopole Remains Elusive.'' Physics 6.34 (2013).

¹⁰ Kovalik, J. and J. Kirschvink. “New superconducting-quantum-interference-device-based constraints on the abundance of magnetic monopoles trapped in matter: An investigation of deeply buried rocks.'' Physical Review 33.2 (1986): 1183--1187.

¹¹ Cabrera, B. “First Results from a Superconductive Detector for Moving Magnetic Monopoles.'' Physical Review Letters 48.20: 1378--1381.

¹² “How much solar energy is available?'' The George Washington Solar Institute. http://solar.gwu.edu/FAQ/solar_potential.html

¹³ “Principle of Magnetic Levitation.'' Shanghai Maglev Transportation Development Co., Ltd. http://www.smtdc.com/en/gycf3.asp

¹⁴ “Edison vs. Westinghouse: A Shocking Rivalry.'' Past Imperfect. Smithsonian Institution, 11 Oct. 2011. http://blogs.smithsonianmag.com/history/2011/10/edison-vs-westinghouse-a-shocking-rivalry/

¹⁵ “War of the Currents.'' Tesla: Life and Legacy. PBS. http://www.pbs.org/tesla/ll/ll_warcur.html