Front Cover: Male Bird of Paradise, Cornell University. Photo Credit: Tim Laman, Macaulay Library. 
Back Cover: Saffron, or autumn crocus (Crocus Sativus) flower with orange-red stigmas and yellow stamens. The three orange stigmas of each flower are collected and dried to make saffron spice. Photo Credit: Wikimedia Commons.
Science Cartoons:
Turkish American Scientists and Scholars Association, http://www.tassausa.org/
Back Inside Cover: Schematic of the Evolution of the Universe, with time passing from left to right. At any given time, the Universe is represented by a disk-shaped slice of the diagram. Credit: Wikimedia Commons.