neat pictures of quantum dots http://www.google.com/search?q=quantum+dots&hl=en&prmd=ivnsbl&tbm=isch&tbo=u&source=univ&sa=X&ei=j3GwTYv5D7HOiALn8_GvBg&sqi=2&ved=0CDwQsAQ&biw=1016&bih=507