Two girls buy a pair of gray pants at a store in the mall, only to discover that they turn lavender outside in daylight. Rollo helps them and their friends to investigate the effect of different kinds of lights on color perception and to understand how a prism splits light and that a spectrometer reveals the light spectra for different gases. His computer shows them how light results from the energy of electron movements in different elements. He also shows them a dark-line spectrum of the sun. Rollo sends the young people to a NASA lab where his friend Crystal helps them understand laser light. When they return, he suggests they investigate the medical uses of laser, compact discs, and holograms.

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