Exploratorium
Exploratorium: Science Snacks: Shadows: The Shadow Knows
This science experiment helps students understand how the size of a shadow depends on the size of the object casting the shadow as well as the position of the light source and screen.
NASA
Nasa: The Space Place: What Is a Laser?
NASA resource explores what a laser is as well as how it works. Animations are provided that offer excellent examples of how different light travels.
TED Talks
Ted: Ted Ed: Sunlight Is Way Older Than You Think
It takes light a zippy eight minutes to reach Earth from the surface of the Sun. But how long does it take that same light to travel from the Sun's core to its surface? Oddly enough, the answer is many thousands of years. Sten Odenwald...
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...
Council for Economic Education
Econ Ed Link: The Mystery of Is It Mine or Ours? (Educator Version)
Did you ride to school on a road today? Yesterday did you skate in a public park? Maybe Mom or Dad traveled home from one of your ball games on their bicycles under a string of street lights? How did the road, the park or the street...