We live in a world of optical marvels - from the commonplace but beautiful rainbow, to the rare and eerie superior mirage. But how many of us really understand how a rainbow is formed, why the setting sun is red and flattened, or even why the sky at night is not absolutely black? This beautiful and informative guide provides clear explanations to all naturally occurring optical phenomena seen with the naked eye, including shadows, halos, water optics, mirages and a host of other spectacles. Separating myth from reality, it outlines the basic principles involved, and supports them with many figures and references. A wealth of rare and spectacular photographs, many in full color, illustrate the phenomena throughout. In this new edition of the highly-acclaimed guide to seeing, photographing and understanding nature's optical delights, the authors have added over 50 new images and provided new material on experiments you can try yourself.

This comprehensive biography of William Sheppard, the first African American Presbyterian missionary, presents the remarkable story of how an African American born in the South during the era of slavery emerged as one of the most distinguished Presbyterian leaders in American history. The book chronicles Sheppard's journey to the Congo, details his efforts to challenge human rights violations, and describes his impact on the areas of religion, human rights, education, and art.