Make a truth teller for light. Turn an old CD into a spectroscope to analyze light—you may be surprised by what you see. Try pointing your CD spectroscope at the fluorescent light in your room, sunlit ...

This activity invites K–5 students, in both English and Spanish, to explore the phenomena of rolling objects down a ramp and investigate the question, “What happens to a roller when you change the ...

Make an inexpensive laser interferometer. An optical interferometer splits a beam of light into two beams that travel at right angles, then recombines them. The resulting interference pattern reveals ...