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When Does 2+2 Not Equal 4?
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Ebony asks…Does mixing moisturizer SPF 20 and tinted moisturizer SPF 20 make SPF 40? The Right Brain responds: We have the smartest readers in the whole wide world. When this question came up in the Forum, astute reader SarahF came up with this answer: Common sense chemistry “…the easiest way of thinking about it is [...] Read more: when-does-22-not-equal-4
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