 This is Science Friday. I'm Anna Rothschild. On a show like this, we feature a lot of studies that have positive results. Say you hypothesize that a honeybee will favor one flower over another, and your research backs that up. That's a positive result. But what about the papers with negative results? If you're a researcher, you know that you're much more likely to disprove your hypothesis than validate it. But there aren't a lot of incentives to go out and publish your failed experiments.