The Miracle Material

It must have happened a number of times in isolated incidents. It didn't just happen in that one single moment, though. But there's a very smart person who did notice and then they shared the information. You'd put rocks on a wood fire to then move those rocks to somewhere where you want the heat to be. Like if you're in a tent, for instance. Or you have them put on your back, don't you, when you go to that special health clinic? That's true, isn't it? Come back. He's talking like that. I mean, maybe you say the chance of it happening is so rare that all through that million years it could have happened