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To: kiryandil
Angle of incidence of the sun and UV rays.

Vitamin D3.

6 posted on 04/08/2021 9:13:37 PM PDT by Doofer ( )
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To: Doofer

Exactly


12 posted on 04/08/2021 10:05:29 PM PDT by kiryandil (China Joe and Paycheck Hunter - the Chink in America's defenses)
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