Current's Mariana van Zeller heads to the Brazilian Amazon to search for the fabled Kambo frog, one of many organisms that could hold secrets for modern medicine. But are other potential cures being lost before they can be discovered?
"Vanguard," airing Mondays at 9/8c on Current TV, is a no-limits documentary series whose award-winning correspondents put themselves in extraordinary situations to immerse viewers in global issues that have a large social significance.
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