Specialette — Cheetahs, Fleas, and Bird's-Eye Berets

You probably know Mary Roach as the author of such Specialist-filled science books as Gulp, Stiff, and Packing for Mars. But like all of us, she had another life before her current one, and it involved fielding accusatory queries about unwell cheetahs. Photo by Jen Siska, jensiska.com.