 You can take still shots of everybody. But it's already recording? It's already recording. Then you can take still shots of everybody. They like to put it... They like a reminder. So, so breakfast will play here. L4. L3. I'm going to go between L3 and L4. See? Yeah. You felt the pop? Did you hear it? Yeah. It was... I didn't hear it, perhaps. You will feel it, don't worry. Very subtle. There. All right. So, this is the rate at which normally CSF should come out. In case, in an actual situation, CSF does not come out, there are three or four things you can do. One, you can ask the patient to cough gently. When you cough, what happens? The internal spinal pressure increases, then CSF starts coming out. If that doesn't work, what you can do is you can gently rotate it in the closed urinal axis without going in or out. Sometimes what happens is a small filament of tissue may block the opening. So, when you do like that, then CSF comes out. And the third thing that you can do is you can take the syringe, you can insert it here, and you can aspirate gently, and you'll see the CSF. So, these are the three things that you can do in actual situation. So, once you've collected the CSF, what we don't have here is the manometer. There's a separate... we didn't order for it or whatever. It's a long burette with graduated markings on it. It's got a three-way stop clock. You can connect it here. And the recording of that will be the CSF spinal manometer. You can also take a sample of CSF for your diagnostic purposes. And after you've done that, again, reinsert the... You can reinsert. You have to reinsert the stillet. And with a little counter pressure here, just pull the thing straight back. And then we put a tincture benzoin seal or otologous blood graft here. Put the patient flat for 24 hours. So, it looks simple. When you do it, you'll find there'll be problems. You will hit the bone. Doesn't matter which way the bevel is. We put it in. In other words, does the bevel have to be pointed up, down? No. Here, because we're going absolutely horizontal, it doesn't matter. It's only when you're doing a vene puncture, then the bevel has to be up because you can see this is how we do it. But here, it doesn't really matter. So, this is the procedure. So, you've recorded it.