And on the, or maybe if you really wanted to do it, you say you have to spend exactly 30 minutes on a computer, and that's maybe a little unrealistic. And then the treatment group, you have to say, you have to spend exactly two hours in front of a computer. And I'm making up these numbers at random. And it would be nice to see, okay, what was everyone's blood pressure before the experiment? And you can say, okay, well, the averages are similar going into the experiment. And then you go some amount of time, and you measure blood pressure. And if you see that, wow, this group definitely has a higher blood pressure.