The authors indicated that sunscreen may be counterproductive because it does not screen out all UV. PLEASE NOTE: Sunscreens have been improved since the publication of this book; they filter UV much more thoroughly. It is now recommended by the medical community that sunscreen be used outdoors. Which are true (using current information)

a. Sunscreen decreases the risk of skin cancer.

b. Some sunglasses do not block UV. These are worse than no sunglasses with respect to developing cataracts.

c. The better predictor of skin cancer is the number of sunburns, rather than total UV exposure over one's lifetime.