TED Talks
Ted: Ted Ed: What Is an Aurora?
Why do we see those stunning lights in the northern- and southernmost portions of the night sky? Michael Molina explains every step of the dazzling phenomenon of the Aurora Borealis and Aurora Australis. [4:10]
NumberNut
Number Nut: Basic Topics: Shapes, Symbols, and Colors: Colors
A short explanation of how we see color and what each of the primary and secondary colors symbolize.
Treehut
Suzy's World: Two Eyes
Use this site to find out why we have two eyes and how they work together.
TeachEngineering
Teach Engineering: Beyond the Milky Way
When we look at the night sky, we see stars and the nearby planets of our own solar system. Many of those stars are actually distant galaxies and glowing clouds of dust and gases called nebulae. The universe is an immense space with...