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How Effective Is Your Sunscreen?

In this video, two boys who spend lots of time outdoors, test which level of sunscreen best protects their skin from the harmful effects of the sun's rays. The boys order a set of special water bottles designed to change color when exposed to ultraviolet rays. They then apply olive oil, shortening, and three sunscreens of different sun protection factors (SPFs) to the bottles and gauge how well they work.

  How Effective Is Your Sunscreen?

http://www.teachersdomain.org/asset/envh10_vid_sunscreen/