In an unscientific survey of Times Square, Science Friday found that not one passerby could explain how sunscreen works. Dermatologist Jennifer Linder explains that and other basics of sun protection, including the meaning of SPF, and whether sunscreen blocks vitamin D production.
Source: http://www.npr.org/2012/07/06/156380368/whats-your-iq-on-spf?ft=1&f=1007
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