A detailed, yet highly readable book, On the Shoulders of Titans should be the starting point for all who are interested in the basic history of the Gemini Program. NASA's second human spaceflight program, Gemini laid the groundwork for the more ambitious Apollo program which put astronauts on the Moon. This informative and entertaining book had long been out of print and is now available in softcover format. Recommended for students, scholars, journalists, hobbyists, and all who are interested in human spaceflight history.