Geek Equations: Lorentz Factors Fueled by Coffee Stains

Illustration by Gregory D. Rothbard

Scientist: "Curved space-time tells matter how to move, and matter tells space-time how to curve." 
Student: "So dude its like a dance... only bigger."

Nahin, Paul J., and Ben Bova. Time Travel : a Writer's Guide to the Real Science of Plausible Time Travel. Cincinnati, OH: Writer's Digest, 1997. Print. pg 53