I'm not a huge fan of Slate but every once in awhile, I really enjoy one of their deep-dives. This article about the source of the spread of Cholera in Haiti is incredible.
One of the several key facts this map fails to note is that three months earlier there had been zero diagnosed cases of cholera in Haiti. In fact, there had never been a diagnosed case of the disease in that country before.
Fascinating investigation and kudos to the person at the CDC that put together that little museum display.