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Okay, so I got that. This one here is. I should have maybe worded it a little bit different, but again it's not a test. So, 17 hours. That was Velma Thomas, and she's the longest person that's actually brought back alive. However, the doctors, they had to use hypothermia to prevent extensive brain damage on her, but she was brought back to life, and she was pretty much back to normal. And it's very, very rare for a person to survive that long and come out pretty much intact. Now, there have been others that have been a bit longer than that. However, those people had multiple strokes, so it's basically bringing a person back to life, a quality of life for them wouldn't be there. For someone who's coming back and they're still relatively intact, 17 hours. It's hard to believe. 17 hours. And that's very, very rare. The next one here is a little bit about the geology. The difference between a rock and a mineral. So what's the difference between a rock and a mineral?