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But, um, the Mohler scale, it was introduced by Frederick Mohl. He's a German geologist and it was introduced in 1812. And he has been in a scale, just a comparative scale for the hardness of minerals. There's ten parts to this scale. Talag-Jitson, calcite, fluoride, apatite, sulfur, coarse, topaz, pyridone, and diamond from leach hard through to the hardest. And geologists, they have a little kit of little ceramic discs and other material in there of hardness that match each one of these on the scale. And out in the field, if they're finding something or want to help identify it, they'll try one of the little squares and scratch the mineral along them to see if it scratches. If it does or doesn't, then it helps them identify what they're actually looking at. So Mohler scale. The next one here, this one might be kind of fun. There's a little bit of trivia to go along with this too. And I've brought this up on nets before, but I thought I'd bring this up tonight. There's a little bit more to go over here. Who are the radium girls? They're also referred to as the radium ladies, but who are the radium girls?