Two electrodes, placed 30 cm apart on a human arm, can transmit data through said arm at about 10 megabits per second, according to researchers at Korea University. (Thanks, Ken Steidle!)
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.