SPF stands for sun protection factor
An SPF of 50 means you can stay in the sun fifty times longer without getting a sunburn
Only UVB rays cause sunburns; UVA cause invisible damage which increases the chance of skin cancer
The best sunscreen to get is one that has broad-spectrum UVA/B protection
The American Association of Dermatology recommends reapplying at least every two hours
after swimming
sweating
moving
and playing beach volleyball
Persistent Pigment Darkening is a method for measuring UVA protection
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