Before telephones were invented, there was no way for you to sing "Happy Birthday" to your friend is she wasn´t in the room with you.
Now you can call anyone, anywhere in the world! How was the phone invented? How has it changed since then? Read and find out how a telephone can carry your voice across oceans and how it has changed the world.
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Level 2 books explore more challeging concepts for children in the primary grades.
Ages 4 to 8