Background Image (Universe Image on Mobile Devices): Public domain Hubble Space Telescope image NGC 2060 of star cluster in Tarantula Nebula. Prepared by the Space Telescope Science Institute (STSci) under NASA contract.
DNA Molecule: Public domain image from Wikimedia Commons. Rendering by Pawel Szczesny, research scientist at the Polish Academy of Sciences, Warsaw, Poland.
Cosmic Microwave Background Image (Not Shown on Mobile devices): Public domain image from Wikimedia Commons. Taken by Wilkinson Microwave Anisotropy Probe. Courtesy of NASA.
Praying Hands: Original pencil drawing by German artist Otto Greiner (1869-1916). Public domain image from Wikimedia Commons. Top and bottom were cropped to emphasize hands.
Book Illustrations: By the author.
