And you can't talk to the entire population, maybe the entire population is millions of people, so you take a sample of, say, 100 people, and you ask them, do you get migraines? And then you say, okay, that percentage of our sample that get migraines, that's a good estimate for the parameter of what percentage of my entire population actually gets migraines. So this was clearly an experiment. Now the next question is, was this experiment conducted well? Well, even when I read it, I was bothered by both groups were told which kind of pill they got. That completely defeats the purpose of a placebo. The placebo effect is, hey, I think I'm taking something good for me, and it's been documented that when you think you're taking a pill that helps you, it oftentimes does help you.