From Arecibo, to the sound of vaginal contractions, to an ad for Doritos—a short history of Earthlings' attempts to communicate with the cosmos. The vaginal sounds recording reached Epsilon Eridani and Tau Ceti in the late 1990s. New Scientist says, "It is unclear what sort of reply we should expect."
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.