Originally posted by Vicki:
Well, going back to Anna's answer, I think they assign a "hardness number" to substances. I'm sure there's some scientific name for this hardness number. Anyway, if diamonds are the hardest substance, and their number is, say, 10, then Clark's nails could be an 11 and his teeth a 12, thus making nail-biting possible.
You are talking about the
Mohr scale . I like the notion that Clark's nails and teeth are harder than diamond.
But then can be the same hardness and still have one cut the other. The only thing that can cut a diamond is
another diamond.