Mohs Hardness Scale

The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and is one of several definitions of hardness in materials science. The method of comparing hardness by seeing which minerals can scratch others, however, is of great antiquity, having been mentioned by Theophrastus in his treatise On Stones, c. 300 BC, followed by Pliny the Elder in his Naturalis Historia, c. 77 AD.
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  • Visual Maths: Accuracy in Art

    … the rules? Cold The single point of this film is coldness and cold weather, so how accurately does it deal with those things? Well, pretty badly to be honest. We know that Elsa is human, as she was born to human parents and her sister is human, and so is everyone else. Given that her power is creating ice and cold, much like Lucius Best/Frozone from…

    Pete Wailes/ SEOgadget- 14 readers -
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