The Metal That Built the Modern World (S9, E31) | Modern Marvels

They constitute the very essence of the modern world; the cadence of our progress sounds in the measured ring of the blacksmith's hammer. From soaring skyscrapers and sturdy bridges to jet planes and rockets, metals play a key role. See more in Season 9, Episode 31, "Metal." Find out more about the...

45 min - How Things Work - HISTORY

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