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FB1561 - $40.50
Do sunscreens really work? Are the SPF ratings accurate? Students use sun print paper to measure the relative effectiveness of sunscreens of varying SPF ratings. The dramatic results give students first-hand experimental data on the effectiveness of...
AP7433 - $50.50
Sunburn! We have all experienced the pain and misery of overexposure to the Sun’s intense “heat.” Sunscreens applied to the skin shield us from the damaging ultraviolet rays. What do sunscreens contain and how do they block this harmful radiation?...
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