Optics for Teens

Going back through my bookmarks, I (Chuck) ran across this site, Optics for Teens.  The site is very basic, but includes great information:

What is optics?
Celebrities and experts in the fields of light
Optical Illusions
Additional links to light and vision 
Gallery Page
Page for Teachers and Parents
The image below is in the site's gallery as an example of the sun seen in three ultraviolet lights