Okay, random thought: for starship kids, how many health class/sex ed lectures must have started out with "Do not stick it in a Jeffries tube. I cannot stress that enough. Those things are for transport of humans and supplies, and if there's a hole drilled in one, I can almost guarantee it's for something else. People have been seriously injured that way. Do not risk it. I reiterate, do not stick it in a Jeffries tube. There's nothing for you in there. The walls are rough and it's dangerous. ...yes? Before you ask, the same goes for test tubes coated in synthetic margarine or engine oil. Once again, do not -"