Science, Computer, Tech > Computer, Science, Technology   Broca's Brain, Reflections On The Romance Of Science, Carl Sagan Carl Sagan, writer and scientist, returns from the frontier to tell us about how the world works. In his delightfully down-to-earth style, he explores and explains a mind-boggling future of intelligent robots, extraterrestrial life and its consequences, and other provocative, fascinating quandaries of the future that we want to see today. $ 3.25          Available: 1      More Information      Study Guide & Reference Material for Commercial Radio Operator Examination, 1955 "Study Guide and Reference Material for Commercial Radio Operator Examinations", U.S. Government Printing Office, Revised, May 15, 1955, Soft cover, 266 pages $ 5.75          Available: 1      More Information      The End Of Eternity, Issac Asimov, Time Travel The End of Eternity is a brisk and totally satisfying thought experiment that poses the question most other time travel books don't even ask: why would you even want to alter events in time? $ 3.45          Available: 1      More Information