Discuss: Why does sunlight provide you with vitamin D?

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Offline thedoc

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If I was on another planet would we see stars the same way? Why do we measure rain in ml? How do we get vitamin D from sunlight? How accurate are DNA tests? What is a lipoma? How long does it take to recover from malaria? Plus, is pollution harming unborn babies?
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« Last Edit: 18/03/2016 16:48:35 by _system »