Dengue

In a completely different kind of germ warfare, researchers have tested out a way to drop mosquitoes infected with disease-fighting bacteria over populations prone to outbreaks of dengue fever. It's an ingenious way to scale up a proven solution.

If you're trying to disperse 300,000 disease-fighting mosquitos per day, using a drone may well be your best bet for doing so. The technology has already been tested in Brazil, where it showed very promising results.