In the Moh's scale of hardness which is used to identify minerals, the numbers 1 to 10 were given to the common minerals... (Soft-Hard)

(1)Talc - Gypsum - Calcite - Fluorite - Apatite - Orthoclase - Quartz - Topaz - Corundum - (10)Diamond

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I don't believe in mathematics. Albert Einstein

Biologically speaking, if something bites you it's more likely to be female. Desmond Morris.

Quantum analysis is scientific dithering

Professor Frink: My observations n'hey, n'hey, show the universe could be a torus Weh, uh, or toriod it may like the typewriters and bananas and the monkeys with big teeth the biting the screaming Mm-hai!

Homer: mmmmm... doughnuts!