Now, you might have heard about double blind experiments. Well, that would be the case where not only do people not know which group they're in, but even their physician or the person who's administering the experiment, they don't know which one they're giving. They don't know if they're giving the placebo or the actual medicine to the group. So let's say we want to do that. So we could do double, double blind experiment. So even the person giving the pill doesn't know which pill they're giving. And you might say, well, why is that important?