Once again, you've randomly assigned them. So control, and then treatment. And what you might say is, okay, for some amount of time, all of you in the control group can only spend a max of 30 minutes in front of a computer. 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?