And does it actually do it better than a placebo? And you're randomly putting the people in both groups to try to distribute any confounding variables that there might be there. So this is clearly an experiment. Now the other options, you might say, well, is this maybe an observational study? And remember, an observational study, observational, that's more of where you look at a population, you look at a group, you ask them a bunch of questions often, or you make a bunch of observations, and you see if there's correlations between two variables. So variable one and variable two, and you're able to make some type of correlational statement. And you're not trying to get at causality.