 Lovely. Okay, so this is measuring how much cortisol there is in my spit? Yeah. Nice. I'm guessing quite a lot. That was quite stressful. To find out my results we'd have to send my spit off to a lab in Germany, which sadly we don't have time for, but luckily I'm not the first person Zach's done this experiment on. Some people did the test in the room I was in, with a red door and windowless walls,