Upozornenie: Nenahrávajte materiály chránené autorskými právami (hudbu na pozadí, filmové alebo televízne klipy atď.)
SMELTING
Metallurgy and smelting are perhaps some of the most important innovations in human history as they changed transportation, warfare, trade, agriculture, and more. Smelting and the working of metals provided a currency system and made the Industrial Revolution - from steam to electricity - possible.
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