The Science of Forgetting - Businessweek

Alternatively, you could just take a pill

The trick then for how to dislodge incorrect information is to build up the storage strength of the correct answer—in other words, to repeat it lots of times. Of course, this assumes the person holding the factually incorrect belief is open to changing it. If someone is not interested in questioning the “fact” that the Apollo moon landing was faked, then he is going to keep believing that.

Still, the idea that the most firmly embraced factual errors are the ones most open to correction is encouraging. People who believe things that are clearly wrong aren’t beyond correction—in fact, the more adamantly wrong they are, the better.

The Science of Forgetting - Businessweek