the.com/steel
the only thing tougher than iron is iron that learned discipline
means A strong, hard alloy of iron and a small amount of carbon, used for tools, blades, construction, and anything that needs to bear weight without bending.
from From Old English 'stēli' or 'style,' tracing back to a Proto-Germanic root 'stahlją' (compare German 'Stahl' and Dutch 'staal'). That Germanic word likely meant something like 'standing firm' or 'firm thing,' possibly from an even older root suggesting solidity — fitting, since steel is iron made stubborn. The verb sense, as in 'steel yourself,' is younger and metaphorical: to harden your nerve the way a smith hardens a blade.
mostly ironSteel is iron with a pinch of carbon, under 2%
infinitely rebornMost recycled material on Earth, melted endlessly
Damascus secretAncient blades held carbon nanotubes, only found recently
self-healingNew alloys regrow cracks at room temperature
skyscraper spineSkyscrapers exist because steel beats stone's weight