THIS DAY IN SCIENCE: Bali Tiger Is Extinct in 1937

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SPF Doesn’t Mean What You Think It Means – YouTube

SPF seems pretty simple. Find a high number, rub some on your nose, and you’re ready for some sunshine. Unfortunately the science behind it is a little more complicated.

Hosted by: Michael Aranda

SciShow has a spinoff podcast! It’s called SciShow Tangents. Check it out at http://www.scishowtangents.org

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