The Food and Drug Administration recently decided to enter the fray in the discussion of sunscreen. In Summer 2012, their findings and rulings will be displayed on every bottle of sunscreen that claims to block the sun. Sunscreens that boast SPF, or sun protection factor, tend to filter only UVB light, which is what causes sunburn. But a shield for UVA light is needed as well - UVA light contributes to skin...