A little knowledge is a dangerous thing, runs the old adage. We beg to differ. A little knowledge, wisely used, can be the difference between life and death. When no one knows what to do in an emergency, lives are needlessly lost. And when local people can be trained to recognize and react to common health threats, communities become healthier, and more stable. Long term, they may even become more prosperous, and people may be less inclined to migrate.