The establishment of dozens of “healing forests” is part of South Korea’s surprising prescription to improve its citizens’ health and wellbeing. Journalist Florence Williams takes a walk in the woods to learn more about this intriguing approach to public health.

On a typical sunny day in the Amazon, 20 billion metric tons of water pass through the trees and into the air. This is more than just a feat of Nature — it’s at the heart of South America’s economy, as researcher Antonio Donato Nobre explains.