It's Not the Heat--It's the Humidity

We are now in Santa Cruz, Bolivia, and it's much lower than La Paz or Cochabamba. We've gone from cold to mild to hot and humid. It sounds like we're going back to cold in Santiago, Chile. Good thing we brought many types of clothing. We leave for Chile at 4 in the morning, and we have to be in the airport 2 hours before that, so we won't be getting much sleep tonight!