Sunscreen science

How does sunscreen work? What does SPF stand for? What number of sunscreen should you use? How much sunscreen should you use? What is the meaning of life?
80% of those questions will be answered in this video!
Thanks to Madeline for asking such a great question.
If you have a science question, let me know on my Facebook page:
/ pmccordic
Or on twitter:
/ pmccordic
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Happy Life by FREDJI / fredjimusic
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