In 2011, satellite images of the African savannas revealed a mystery: these rolling grasslands, with their heavy rainfalls and spells of drought, were home to significantly fewer trees than researchers had expected. Scientists supposed that the ecosystem's high annual precipitation would result in greater tree growth. Yet a 2011 study found that the more instances of heavy rainfall a savanna received, the fewer trees it had. To this ecological riddle, Princeton University use mathematical equations to show that physiological differences between trees and grasses are enough to explain the curious phenomenon. Read more at the Princeton website.