Science 

• Calculator.com --  conversions and all kinds of predictions
• Discovery Channel
• How Stuff Works
• How things Work-- explains simple and profound processes in the world
• Nobel Prize Archive
• Periodic Table available for download in Excel format
• Psychology and Brain Links
• Yahoo! Ag/Bio links

Discovery Channel Sites

• Discovery Channel
• Discovery Civilization
• Discovery Health
• Discovery Home & Leisure
• Discovery Kids
• Discovery Science
• Discovery Wings

Science Biographies

• Eric's Treasure Trove of Scientific Biography
• Faces of Science: African Americans in the Sciences
• BrightSPARCS
• 4,000 Years Of Women In Science
• Feynman, Richard, 1918-1988
• Einstein Online
• Einstein Revealed - NOVA
• Invention and Inventors Index
• Inventors' Hall of Fame
• History of Science, Technology, and Medicine