References Baker, R. "Sharp Blue: Relativity, FTL and Causality." Sharp Blue. Web. 22 Apr. 2011. www.theculture.org Biba, Erin. "Harvard Physicist Plays Magician With the Speed of Light." Wired.com. Condé Nast Publications, 23 Oct. 2007. Web. 19 Apr. 2011. www.wired.com "Phase, Group, and Signal Velocity." MathPages. Web. 19 Apr. 2011. www.mathpages.com Quimby, Richard S. "Chapter 2: Review of Optics." Photonics and Lasers: an Introduction. Hoboken, NJ: John Wiley & Sons, 2006. 9-10. Wolfram Demonstrations Barnhart, D. "Light Refraction with a Waterdrop." Wolfram Demonstrations Project. Wolfram Research. Web. 22 Apr. 2011. demonstrations.wolfram.com Schreiber, M. "Light Cone Causality." Wolfram Demonstrations Project. Wolfram Research. Web. 22 Apr. 2011. demonstrations.wolfram.com Wu, F. "Complex Addition of Harmonic Motions and the Phenomenon of Beats." Wolfram Demonstrations Project. Wolfram Research. Web. 22 Apr. 2011. demonstrations.wolfram.com Zeleny, E. "Electromagnetic Wave." Wolfram Demonstrations Project. Wolfram Research. Web. 22 Apr. 2011. demonstrations.wolfram.com Zeleny, E. "Group and Phase Velocity." Wolfram Demonstrations Project. Wolfram Research. Web. 22 Apr. 2011. demonstrations.wolfram.com
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