Charles Keller Books

ALEXANDER THE GRAP
ALEXANDER THE GRAP

By Charles Keller

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A collection of humorous riddles incorporating fruits and vegetables, such as, "What's a raisin? A worried grape."

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Astronuts
Astronuts

By Charles Keller

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A collection of jokes and riddles about outer space, including "Where is a cinnamon man from? Outer spice."

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Ballpoint bananas and other jokes for kids
Ballpoint bananas and other jokes for kids

By Charles Keller

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A selection of riddles and humorous rhymes, both traditional and contemporary.

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The Best of Rube Goldberg
The Best of Rube Goldberg

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Count Draculations!
Count Draculations!

By Charles Keller

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A collection of humorous riddles about monsters.

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Daffynitions
Daffynitions

By Charles Keller

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Text and cartoons offer humorous definitions for a number of familiar words and expressions.

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Colossal fossils: Dinosaur riddles
Colossal fossils: Dinosaur riddles

By Charles Keller

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A collection of humorous riddles involving dinosaurs.

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Giggle puss: Pet jokes for kids
Giggle puss: Pet jokes for kids

By Charles Keller

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A collection of jokes about house pets.

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What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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