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 bridge first and then walked over it. Given that the steps are maybe a couple of inches thick, they’re probably able to support one not very heavy person. So she might be able to walk along it. However, when the ice giant monster hits it while it falls late in the film, that would shatter it, killing everyone who’s on it. And moments later…

    Pete Wailes/ SEOgadget- 10 readers -
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