Brains On! Science podcast for kids · Brains On Universe

How is metal made?

December 2, 2025·29 min·2 clips

Did you know the metal in your jewelry was forged inside massive exploding stars?

This episode of Brains On! explores the origins and early human use of metal, hosted by Molly Bloom with kid co-host Ava from Florida. Guest Dylan Thuras from Atlas Obscura joins to discuss the history from his book, "The Atlas Obscura Explorer's Guide for Inventing the World." The episode explains that most metal originates from massive exploding stars that create and scatter elements across space. Early humans first used metal they found, like soft copper or gold, or from iron meteorites that fell from the sky, such as the blade in King Tutankhamun's dagger. The story of Ötzi the Iceman, a 5,300-year-old body found frozen in the Italian Alps, reveals an early copper axe made through smelting, where metal is extracted from rock by heating. Humans later developed stronger metals, like bronze from mixing copper and tin, and eventually steel. The Haya people in Tanzania, around 2,000 years ago, built kilns from termite mound mud to create high-temperature furnaces and added charcoal to iron to make carbon-infused steel. A surprising insight is that the fundamental materials for Earth's metals were forged inside distant stars and delivered via cosmic explosions. The discovery that King Tut's iron dagger likely came from a meteorite positions such objects as historically sacred "gifts from the gods." The detailed account of the Haya people's innovative process—using termite mound mud for its heat-reflective properties and adding charcoal for carbon—highlights independent, global advancements in metallurgy. The murder mystery of Ötzi provides a tangible link to ancient metalworking, showing sophisticated smelting and trade networks existed over five millennia ago. The tone is educational and conversational, blending factual science with playful banter between the hosts about their new headquarters. The style is narrative, weaving together astronomy, archaeology, and history with kid-friendly analogies, like comparing metal casting to pouring chocolate into molds. Young science enthusiasts curious about everyday materials, history, and archaeology would love this episode's mix of cosmic origins and ancient detective work. Listeners preferring a purely modern or non-narrative science discussion might find the historical focus less engaging.

As heard by us

Metal is framed as a buried material that becomes tools, jewelry, and messages, with a brief detour through fire, glass, and meteorites.

The episode treats metal as a material with a long reach, moving from things buried deep in the ground or locked in rocks to tools, armor, jewelry, and messages that travel around the world.

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Why you'd press play

You get metal's origin story, from copper beads and gold ornaments to iron meteorites and a chain of invention.

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