Leaders have mosquito problems too. We face seemingly insignificant “bites” of setbacks and opposition that can turn healthy environments into sick ones. In every organization, “mosquitoes” are more than annoying; they create fear and distrust, distract people from their tasks, and can wreck the whole endeavor. At the canal, the insects—the diseases they spread or the fear of sickness and death—affected every person from the lowest laborer to the chief engineer, as well as their families. In our