The Darién Gap is a small stretch of rugged, swampy terrain between Panama and Colombia. It's the only point in the 48,000 mile long Pan-American highway where the highway literally stops — because it can't go forward.
Julia Kumari Drapkin reports from Panama on efforts to protect jaguars, the biggest cats in the all of the Americas. She profiles one group's work to find the corridors that jaguars use to move between protected areas.
A multibillion-dollar expansion of the Panama Canal is proving a boon to scientists. The construction has revealed a trove of fossils, revealing a wide array of creatures that lived at the southern end of North America 20 millions years ago.