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Normal people starting to catch on?
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Brien Foerster preaching to the choir. ....again.
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For most of the history of Egypt, the tools used to shape stone consisted of hardened bronze, which is much softer than iron.
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Else at the collapse of the Bronze Age, when tin supplies were unobtainium, iron was resorted to because it was harder to work but more available.
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And bronze, the other tool substance known to and used by the ancient Egyptians is much softer, being on average 3.5 on the Mohs scale.
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Who's average? I thought there was a lost tempering technique to harden copper or bronze. Cryogenics?
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https://en.wikipedia.org › wiki › Cryogenics
Cryogenics - Wikipedia
In physics, cryogenics is the production and behaviour of materials at very low temperatures . The 13th IIR International Congress of Refrigeration (held in Washington DC in 1971) endorsed a universal definition of "cryogenics" and "cryogenic" by accepting a threshold of 120 K (or -153 °C) to distinguish these terms from the conventional ...
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