People have long studied and celebrated the ancient Greek mathematician and inventor Archimedes. His greatest invention--the Archimedes screw--is still used in some countries to raise water to a higher level. Bill Gates is well known for his contributions to computer technology and the development of computer software. Detailed profiles of these and many other notable inventors are thoughtfully collected within the guides of this important set. Some biographies are supported by photographs and primary sources. Readers will be fascinated and inspired by the amazing stories of the world's most influential inventors.