How Did the First Clocks Work?
How Did the First Clocks Work? The earliest known clocks are sundials. In the ruins of Egypt, a giant sundial, almost 100 feet tall, has bee
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Dial
How Does a Sundial Tell Time?
How Does a Sundial Tell Time? Long before we had clocks, people used sundials to tell time. A sundial tells time by measuring the angle of a
How Does the Radio Antenna Work?
How Does the Radio Antenna Work? The radio antenna on a car or on your home set is like an ear, listening for radio waves sent out by broadc