Although they lack the often-creepy Dadaism of 1980s Super Friends valentines, these science-themed Valentine's Day cards—made by stephoodle on Etsy—are utterly charming. My only complaint: I wish there were more female scientists in the mix. (Insert your own Jane Goodall Valentine's Day card joke here.)
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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.