Both sunscreen, insect repellent do expire
(WorldNews Health)

Hello, dear readers, and welcome to our first letters column of the summer. We’ve had a lot of mail — thank you! — so we’re diving right in. • Let’s start with a question regarding two essential tools of outdoor summer living — sunscreen and insect repellent. A number of you have written to ask how long these products remain effective. It’s true that most don’t include an expiration date on the packaging. However, the Food and Drug Administration requires sunscreen to maintain its original...