We live in a material world. Each piece of that stuff has a story behind it – from the inconspicuous glass and steel that fashions our built environments to the transistors in the tech that siphons up all our attention. In this week's conversation, host Carolyn Wilke speaks with scientist and science writer Ainissa Ramirez, author of "The Alchemy of Us: How Humans and Matter Transformed One Another", to pull back the curtain on the materials that have shaped society and the seemingly unlikely people behind them.