Satellites are in outer space. They are sent into the sky from Earth. Once they get in position, the orbit Earth. People use them to get signals all over the world. This includes signals received by GPS devices. GPS devices can give people directions.
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Have you or your parents used GPS to get from one place to another?
Have you read another book about GPS or other modern technology? What did you learn in that book?
Do you think GPS is useful to the world as a whole? Why or why not?
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