193: It's Like a Pool of Liver!
Dear Hank & John
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What Is SPF?
S p f is like a unit of measurement, right? How much solar radiation passes through something. So in the same way that kilograms are a unit of mass, s p f is a unit of transmission of solar radiation. That's just a way of us being able to quantify how much certain wave links of radiation can be blocked by a anything. I thought it stood for sadi performs fantastically. You tell me when you've had enough, because i i can keep going!
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