Sandra Markle Books

Icky squishy science
Icky squishy science

By Sandra Markle

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Details numerous science experiments which can be done at home, explains the various scientific phenomena involved, and suggests further experiments.

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Digging Deeper
Digging Deeper

By Sandra Markle

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Earth Alive
Earth Alive

By Sandra Markle

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Growing up wild
Growing up wild

By Sandra Markle

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Text and color photographs show how gray wolf cubs are born and grow up in the wild.

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Outside and Inside You
Outside and Inside You

By Sandra Markle

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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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