More from Matt & Ilya on "That Works": https://bit.ly/2D0A6qk
More about steel from Shadiversity:
— "When Was Steel Invented" https://bit.ly/2uSwcvh
— "The Riddle of Steel" https://bit.ly/2G6TB28
— "The Oldest Steel Sword" https://bit.ly/2VvWVZZ
CORRECTION from 12:10 — The back of a Katana after differential hardening process is a lower-carbon STEEL, but it is still Steel rather than Iron. My mistake. The higher-carbon content Martensite forms the cutting edge, and low-carbon steel forms the spine.
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