 They work incredibly fast. And anyone who works with dolphins will tell you they're incredibly quick. They have these extraordinarily quick minds. But one of the things that's extraordinary about the phonar is that if you're a dolphin with phonar, they can kind of get incredibly accurate. I think they can tell the difference of a thickness from about a fingernail from about 20 metres away. But they can also look through things. So if a dolphin is looking at you with phonar,