title: Why rgb and not cmy?
body: <p>Seeing as how the three primary colors are cyan, magenta and yellow (CMY), why do monitors and almost all the GUI components out there use red, green and blue (RGB)? (If I'm not mistaken, printers use the CMYK model.)</p>
  
  <p>Is there a historical, hardware/software, or other reason for it?</p>