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Paley’s Watch Found

There actually is a clock in the heath, and it's in our bodies, too.

Learn How to Operate Your Body

You have built-in machinery and software that's beyond your awareness. Here are ways to enlist your equipment for better health.

Mind Your Brain

Recent discoveries about the brain and the mind reveal the wonders inside our skulls and pose deep philosophical questions.

Ready, Aim, Flower

How does a plant know the time to flower? A new study describes a process involving genes, sunlight sensors, switches, clocks, feedback loops and messages.

Are Biological Clocks Like Paley’s Watch?

What is a clock made of? We think of springs, gears and moving parts made out of metal. But a clock could, in theory, be designed with almost any material. There are water clocks, sundials, and electromagnetic oscillators that all function to tell time. What difference does it make if the parts are made of liquids, laser beams, or plastic? What if a clock was made of biological material—would it be any less a device for keeping time? Would it surprise you that such clocks exist in your body and in every living thing?
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