Devices — cards for kids
12 cards: a picture, a short story and audio
How Books Are Printed
Books are printed on huge machines called printing presses. They put letters on paper so fast that in a minute they can print as many pages as you couldn't read in a year. It's as if a very fast artist were drawing every page.
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How Books Are Printed
Why We Hear
The Secret of a Magnifying Glass
Why an Airplane Flies
Clocks and Time
Why a Light Bulb Glows
Why a Toy Is Soft
How a Fridge Works
A Homemade Compass
How a Bicycle Works
A Phone Call
How a Microwave Works
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