Joly smiles, almost as obviously enthusiastic. "It's a monitor. It sees and records so much information! Here-- John, do you mind if I start with you?" Since John is actually sitting down, and all. But Joly can hardly criticize anyone for wanting to run around and see how things work! "See, here are scanners, on the end of these arms-- and I move this here, it will record and examine brain activity, and this here, this will monitor vital organs--" He explains everything,step by step, arranging the scanners and monitors. And then he turns it on, and a half-dozen screens light up with information that would take a doctor hours to collect in their time, and longer to collate.

But something simple first--" See this line? That's your heart activity. John, you can feel your heart beat, how it matches those spikes? And this is blood pressure, here--ah, that's a good number! That's how hard your heart is beating to pump blood out, you see, and that's the pressure to pull it back in."

There's so much to explain! And John is even rather healthy--surprisingly healthy, for a child in the time any of them would call home. Only-- "Listen, when we're done here, you need to go eat, all right? Both of you. I'll talk to Bar, she'll give you as much as you like, anything you like best. So don't skip meals, while you're here." John seems to have both skipped a lot of meals, and had a lot of the wrong thing-- and Joly knows Combeferre never takes attends well to food, unless it's with coffee. But John especially could use some of the healthy food Bar can give so easily. He'll make sure it happens. Children need to eat.