Why Do Medicines Come in Different Forms?
Why Do Medicines Come in Different Forms? Sometimes it seems like there are more medicines than there are diseases, and it can be hard to keep them straight. Some...
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Why Do We Grow Old?
Why Do We Grow Old? Scientists have evolved three main theories to explain why we grow old. The first concerns the loss of cells or of irreplaceable parts. Brain cells...
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Why Do Vinegar and Baking Soda React the Way They Do?
Why Do Vinegar and Baking Soda React the Way They Do? Baking soda and vinegar react chemically because one is a base and the other is an acid. Baking soda is a basic...
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Why Is Chlorine Used to Clean Swimming Pools?
Why Is Chlorine Used to Clean Swimming Pools? Swimming pool sanitation is the process of ensuring healthy conditions in swimming pools, hot tubs, plunge pools, and...
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When Does Pollution Kill a River?
When Does Pollution Kill a River? A river will die when pollution reaches such a level that all the available oxygen is absorbed. This can happen if the oxygen is used...
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