Fresh Air on KAZU

The list of fermented food in our lives is staggering: bread, coffee, pickles, beer, cheese, yogurt and soy sauce are all transformed at some point during their production process by microscopic organisms that extend their usefulness and enhance their flavors.

The process of fermenting our food isn't a new one: Evidence indicates that early civilizations were making wine and beer between 7,000 and 8,000 years ago — and bread even before that.

The Colombian harpist Edmar Castañeda was born in Bogotá, and began playing at 13. A few years later, in the mid-1990s, he moved to New York, where he studied jazz trumpet. Then he returned to the harp with a new perspective and set of skills.

Kristen Iversen spent years in Europe looking for things to write about before realizing that biggest story she'd ever cover was in the backyard where she grew up. Iversen spent her childhood in Colorado close to the Rocky Flats nuclear weapons factory, playing in fields and swimming in lakes and streams that it now appears were contaminated with plutonium. Later, as a single mother, Iversen worked at the plant but knew little of its environmental and health risks until she saw a feature about it on Nightline.