Harold Gale Books

Number pocket puzzles
Number pocket puzzles

By Harold Gale

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Mensa number puzzles for kids
Mensa number puzzles for kids

By Harold Gale, Carolyn Skitt

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A collection of over 200 weird and wonderful puzzles -- magic number squares, series puzzles, grid problems, connect the and more.

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Boost Your IQ
Boost Your IQ

By Harold Gale

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Mega Mazes. Mensa Ser
Mega Mazes. Mensa Ser

By Harold Gale

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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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