A panda at the Smithsonian National Zoo is not pregnant. Why is this news? Because, apparently, pandas frequently have pseudo-pregnancies that trick even experienced zoologists. I'm starting to think The Animal Review is right about these things.
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.