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Dramatic results mimic effects on living tissue. Do sunscreens and sunglasses really work to block damaging UV rays? Your class treats the lid of a Petri dish containing a sun-sensitive yeast strain with sunscreen or covers part of it with sunglasses, leaving part exposed to ultraviolet wavelengths from the sun. After incubating the plate, students can gauge the effects of the sun on the yeast cells, applying their findings to humans as well. Other simple experiments explore additional factors such as the angle of the sun, ozone depletion, and air pollution. Includes materials for 24 students.

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