3.___________

The ideal sunscreen to use is an SPF15. This means a sunscreen which gives you fifteen times more protection that you would have normally. An SPF15 sunscreen will absorb proportionally equal amounts of UVA and UVB, and will give you good protection if you are sensible about your exposure. Sunscreens higher than SPF15 tend to lose their balanced effect: the chemicals in an SPF30, for example, will not block UVA rays as effectively as UVB. The other danger with high SPFs is that people will stay in the sun longer because they think are better protected. Higher SPFs do not give proportionately greater protection. An SPF15 gives 93 percent protection, for example, while an SPF34 gives 97 percent protection.