There's often a really interesting story behind a retraction. That's what Ivan Oransky told us. He's a doctor and journalist and founder, along with Adam Marcus, of a blog called Retraction Watch. They monitor scientific journals and investigate why articles were retracted. They uncovered serious ethical breaches at a variety of journals. Oransky tells Brooke about some of the stories he's covered this year.

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When a paper released by a scientific journal turns out to be wrong, either due to human error or intentional fraud , the journal’s editors often will issue a retraction advising scientists to disregard the research. A Wall Street Journal study has found the number of such retractions to be soaring. New Yorker science writer Jonah Lehrer tells Brooke what he thinks is going on.