Jeffrey Schultz Books

Civil twilight
Civil twilight

By Jeffrey Schultz

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"'Civil twilight' occurs just before dawn and just after dusk, when there is still light enough to distinguish the shapes and contours of objects but not the richness of their detail. Beginning wit...

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Learning to Communicate
Learning to Communicate

By Roberta Truax

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Civil Twilight
Civil Twilight

By Jeffrey Schultz

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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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