Of all the places I have visited, the most impressive is the salar de uyuni, the world’s largest salt flat, and its surroundings. This area is so unique and amazing that it is hard to find the right words to describe it. I will try anyhow. As we visited at the end of the rainy [...]

They went to villages in trouble and got the villagers to help them identify who among them had the best-nourished children—who among them had demonstrated what Jerry Sternin termed a “positive deviance” from the norm. The villagers then visited those mothers at home to see exactly what they were doing. Just that was revolutionary. The [...]