CAHUIDE, Peru - Aedes, a grayish four-propeller drone, whirred off the dirt soccer field in this Amazon village to help do what doctors cannot as climate change threatens this nation with a new era of disease. Named after the mosquito that transmits dengue fever, it quickly rose above the excited gaggle of flip-flopped kids gathered to see it off and past their homes' corroded metal roofs. Soon, it was nearly 400 feet high, scanning roads cutting into the jungle for new signs of disease-spreadin