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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.

Arts, Culture & Media

Amazon activist remembered

Amazon rainforest activist Chico Mendes was murdered 20 years ago today. Anchor Lisa Mullins speaks with BBC environmental correspondent Tim Hirsch about Mendes' legacy and the ongoing struggles in Brazil to slow deforestation.