The World's 20 Greatest Unsolved Problems. Questo articolo non è disponibile.The World's 20 Greatest Unsolved Problems

Not here are such questions as how to find world peace, the relative influence of nature and nurture, or why a few people are so filthy rich while so many are dirt poor. Rather Vacca, an information technology consultant with a background at the US National Aeronautics and Space Administration, looks at current debates in astronomy and cosmology, physics and astrophysics, biology and paleontology, neuroscience, geology, chemistry, and energy. Annotation ©2004 Book News, Inc., Portland, OR (booknews.com)

John R. Vacca is an information technology consultant and internationally known author based in Pomeroy, Ohio. Since 1982, Vacca has authored 42 books and more thon 490 articles. He also served as a configuration management specialist, computer specialist, and the computer security official (CSO) for NASA's Freedom space station program and the International Space Station program, from 1988 until his early retirement from NASA in 1995. John is also a freelance book editor for Barnes & Noble online and was one of the security consultants for the MGM movie AntiTrust.