Useful Links

The difference between chemical and physical sunscreens and the UV filters involved:
http://www.skinacea.com/sunscreen/physical-vs-chemical-sunscreen.html

How the PPD and PA rating systems work:
http://www.skinacea.com/faq/sunscreen/s06-ppd-vs-pa.html

The difference between UVA and UVB rays:
http://www.skincancer.org/prevention/uva-and-uvb

Sunscreen regulations in Australia:
https://www.tga.gov.au/publication/australian-regulatory-guidelines-sunscreens-args

Skin cancer statistics in Australia:
http://www.cancer.org.au/about-cancer/what-is-cancer/facts-and-figures.html

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