« Where are the men's voices? | Main | Not so profound thought for the day. »

24 October 2007


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interesting. i learnt about Moh's scale of hardness only whern studying geology advanced-level at the age of 18. i'm very impressed your teaching it to a 7 year old. now - can you recite the scale from 1 - 10. 1 is talc, 10 is diamond.. a test for you!

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I think I read something somewhere about this

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    bearing blog


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