Hidden Figures: The American Dream and the Untold Story of the Black Women Mathematicians Who Helped Win the Space Race

by Margot Lee Shetterly

As a plane accelerated from high subsonic speeds to low supersonic speeds, passing through the unsteady “transonic” region between Mach .8 and Mach 1.2, the simultaneous presence of subsonic and supersonic flows caused buffeting and instability.