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• Basics of the 4 Color (CMYK) Printing Process, and another link from Pantone
  
   
• Rendition of a black hole, courtesy of the AstroSociety
   
• Information on the math constant "Pi"  
  • Calculations of Pi (a couple of sample calculations)
  • See also Wolfram Research's info on Pi calculation
  • National Pi Day
     
• DNA References
  • Rare Semi-Identical Twins Discovered (two sperm cells fertilized one egg which then split)
  • DNA Tests Could Reveal Unknown Proof of Incest
  • Unwinding DNA
    
• Chemistry and the Periodic Table
  • Electromagnetic Spectrum, check out this NASA site!
    
  • Periodic Table of Elements
    
• How Differentials on an Automobile Work (From HowStuffWorks.com)
   
• Electromagnetic Radiation (no bookmarks made thus far)
   
• SkyMaps website, interesting for the basic astronomer (evening sky maps available)
  
  
• Look at this "Units" conversion program