The fifth entry in the slide show of doom, entitled "Misleading SPF," says there is no evidence that higher SPF ratings guarantee increased protection. Furthermore...
...the average person uses only 20%-50% of the amount used to achieve the advertised SPF rating.Uses only a percentage of the amount used? That should be "20% to 50% of the amount needed..."
In any case, I'm taking this advisory as a green light to ditch the smelly lotions and start rocking the Speedos. Even in the supermarket.