A lot of us don’t wear sunscreen nearly as often as we should. Sometimes that’s because we don’t reapply it often enough (you should slather on more every two hours you are out and about in the sun, and more often if you’re swimming) or we don’t apply as much as we really need in the first place (you should be using more than an ounce if you’re covering your beachwear-clad body from head to toe).