Article: Your Amazing Body Clock.

Imagine a very special clock, silent and unseen to most. No winding, batteries, or electricity are needed.

Scientists call this special clock a "biological clock." Each of us has one of these mysterious timepieces in our body. Some scientists believe it can be found in our brain. Others believe it is hidden elsewhere in our body.

How important is this "body clock"? Scientists are slowly discovering the many jobs it does for us.

Controlling body temperature is one of its jobs. Did you know that your "normal" temperature rises and falls about two degrees each day? At night, our body clock prepares us for sleep by lowering our temperature. We ...

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