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Summertime Science: Sunburn, Sweat, and Wrinkly Fingers

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Why do we sweat? Why do our fingers wrinkle in water? Why do we get sunburns? Joe Hanson explains it all in this summer science episode of It’s Okay to Be Smart. Bonus: Find out what those SPF numbers mean on your sunscreen.

joe hanson
sweat
wrinkly fingers
Related videos about how our bodies work:
You Are Your Microbes
• The Beautiful Physics and Math of Sneezes
The Mystery of Motion Sickness
Telegraph Line (Nervous System)
• How Much Stuff Do Our Bodies Make In A Year?

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