environment

Science, Tech & Environment

This backcountry cook you've never heard of is a legend at Yosemite National Park

Ever heard of Sing Peak in Yosemite National Park? Turns out, it has nothing to do with music. It honors the park's Chinese immigrant past — and an amazing backcountry chef named Tie Sing. A park ranger at Yosemite did some digging and unearthed the hidden history of Sing and the immigrants who helped create the park we know today.

Science, Tech & Environment

Geo answer

We were looking for a tributary of the Amazon that starts in the Brazilian state of Mato Grosso. The answer is the Xingu River. Researchers working near the source of the river have un-covered traces of ancient settlements -- known as "lost cities" -- buried under a thick layer of jungle. Lisa Mullins speaks with Michael Heckenberger, a professor of Anthropology at the University of Florida who led an expedition to the region.