What is a laser? Illustrated discussion of lasers includes how they work and how they are used.

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. Today, we will talk about neodymium, an element used in certain laser pointers which, according to the professor, are great gifts for those...

Solve subtraction problems to blast the slimes with your laser before they slime you!

This site from the National Aeronautics and Space Administration allows students to explore topics related to planet earth and outer space. A number of games and interactive features are available.

Detailed information about the condition of Astigmatism including symptoms, causes, types, test to determine, and correction options.

An investigation into the total internal reflection of light, using a laser pointer. Accompanied by an explanation of what's happening, a discussion of Snell's Law, and links to additional information.