3 Randomista's win Nobel prize in economics

...for using Randomized Control Trials to figure out which policies work and which do not. 
Here are some blog posts on information from randomized control trials:

• Before going on a date, consult an economist
• Randomistas: fighting poverty with science
• What do physicians have in common with pilots?
• Book recommendation: Randomistas

Below is a Ted Talk from one of the winners (I suspect that it would be profitable for business to run more randomized control trials, e.g., to estimate the effects of advertising campaigns.