Nature

An outhouse. For pooping
Audio

At the University of Colorado, microbiologist Rob Knight is exploring a new frontier — the human microbiome.

Double Arch (NPS Photo by Jacob W. Frank)
Photo Gallery

Steve presents a profile of Edward Abbey, whose book "Desert Solitaire" changed the way people thought about the desert. Abbey inspired many of today's environmental activists. We hear excerpts from Abbey's work and his admirers.

Length: 
11:20
Lips curled back
Audio

"Disgustologist" Valerie Curtis talks about a powerful driver of human emotion.

Length: 
11:45

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