I received this note from a friend serving in an orphanage in a developing country: “Yesterday, as I was sitting at my office desk, I noticed a trail of ants on the floor. As I followed it, I was shocked to see that thousands of ants had blanketed the walls of our office building—inside and out. They swarmed everything. Fortunately, one of the workers . . . set to work. Less than an hour later, the ants were gone.”