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How to Make Everything Video: https://youtu.be/lMXAY5F28L0
Veritasium Video: https://www.youtube.com/watch?v=V9K6gjR07Po
 
To learn more about CuriosityStream, go to http://curiositystream.com/physicsgirl
 
Creator: Dianna Cowern
Videography: Chris Peck, Dianna Cowern, Derek Muller and Eric Birkemeier
Editing: Jabril Ashe
 
Thanks to Dan Walsh, and congratulations on his PhD!
 
Thanks to Kyle Kitzmiller and Unicorn Snot
 
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Resources and Further reading: 

“The Food and Drug Administration (FDA) is proposing to limit the maximum labeled SPF value for over-the-counter (OTC) sunscreen drug products to ‘‘50+.’
https://www.gpo.gov/fdsys/pkg/FR-2011-06-17/pdf/2011-14769.pdf

NYT Article on SPF 50 
https://www.nytimes.com/2011/06/15/science/15sun.html

FDA: Understanding over the counter sunscreens
https://www.fda.gov/drugs/resourcesforyou/consumers/buyingusingmedicinesafely/understandingover-the-countermedicines/ucm258468.htm 

Sunscreen Penetration of Human Skin and Related Keratinocyte Toxicity after Topical Application
https://www.karger.com/Article/Abstract/85861

Regulatory Policy Information for the Sunscreen Innovation Act (information on FDA’s rejection of new sunscreen ingredients)
https://www.fda.gov/Drugs/GuidanceComplianceRegulatoryInformation/ucm434843.htm 

https://www.ncbi.nlm.nih.gov/pubmed/15908756 

NEW SIA (sunscreen innvation act): https://www.fda.gov/Drugs/GuidanceComplianceRegulatoryInformation/ucm434782.htm

Schedule of sunscreen lettesr: https://www.fda.gov/Drugs/GuidanceComplianceRegulatoryInformation/ucm434843.htm 

FDA blog safety and effectiveness data: https://blogs.fda.gov/fdavoice/index.php/2016/11/fdas-sunscreen-guidance-outlines-safety-and-effectiveness-data-recommended-for-additional-active-ingredients/ 
 
Sunscreen + coral reefs
https://www.washingtonpost.com/news/energy-environment/wp/2018/07/02/hawaii-is-about-to-ban-your-favorite-sunscreen-to-protect-its-coral-reefs/?noredirect=on&utm_term=.bba2187271ad

”SPF 100 vs 50 study”
https://www.sciencedirect.com/science/article/pii/S0190962217329080

Screenshot of “health blog”
https://www.huffingtonpost.com.au/2016/11/29/chemical-versus-physical-sunscreen-whats-the-difference_a_21616016/
 
Overview of suncreen ingredients
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3543289/
 
“Titanium dioxide and zinc oxide provide UV protection primarily via absorption of UV radiation and not through significant reflection or scattering.”
https://onlinelibrary.wiley.com/doi/abs/10.1111/phpp.12214
 
From the FDA’s website:
“Although the protective action of sunscreen products takes place on the surface of the skin, there is evidence that at least some sunscreen active ingredients may be absorbed through the skin and enter the body”
https://www.fda.gov/Drugs/ResourcesForYou/Consumers/BuyingUsingMedicineSafely/UnderstandingOver-the-CounterMedicines/ucm239463.htm#ingredients
 
In 2014, the FDA updated sunscreen ingredient proposal rules
https://www.fda.gov/drugs/guidancecomplianceregulatoryinformation/ucm434782.htm 

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