Ig Nobel winners: Knuckle cracking to panda poo

Have you ever worried that knuckle cracking will give you arthritis or wondered why pregnant women don't tip over? Me too.

Research into those topics--as well as studies finding that diamonds could be created from tequila and giant panda feces are good for composting--received Ig Nobel Prizes in a ceremony on Thursday night at Harvard University.

The prizes, awarded to scientific achievements that "cannot and should not be reproduced," are presented in the week before the real Nobel prizes are announced and are sponsored by the science humor magazine "Annals of Improbable Research."

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