Clint Snyder, age 10, of Boardman, Ohio, for his question:

HOW COME A FISH NEVER BLINKS?

In order to blink, one needs movable eyelids. A fish's eyelids are sealed shut, which is why he cannot blink them open and shut. If his eyelids were like ours, he would be unable to see. However, they are made of glassy skin which acts like windows. He needs eyelids of this sort to protect his eyes from floating objects in the water. However, his special eyelids give him a fixed glassy stare, and when he takes a nap he cannot shut out the sights.