When Joanne Simpson (1923-2010) was a girl, she sailed her boat beneath the puffy white clouds of Cape Cod. As a pilot, she flew her plane so high, its wings almost touched them. And when World War II began and Joanne moved to the University of Chicago, a professor asked her to teach Air Force officers about those very clouds and the weather-changing winds. As soon as the war ended, Joanne decided to seriously study the clouds she had grown to love...