Seonglae ChoFe, Steal
지구상 가장 많은 질량 차지
Irons
The Entire History of Steel
From hunks of iron streaking through the sky, to the construction of skyscrapers and megastructures, this is the history of the world's greatest alloy.
https://www.popularmechanics.com/technology/infrastructure/a20722505/history-of-steel/
