And once again, some of this might have just happened randomly. It might have been, you know, the people you happened to put in there, et cetera, et cetera. But depending, if this was a large enough experiment, and you conducted it well, this says, hey, look, there's, I'm feeling like there's a causality here. That by making these people spend more time in front of a computer, that that actually raised their blood pressure. So once again, sample study, you're trying to estimate a population parameter. Observation study, you are seeing if there is a correlation between two things. And you have to be careful not to say, hey, one is causing the other, because you could have confounding variables.