Christopher Vaughan Books

The Promise of Sleep
The Promise of Sleep

By Christopher Vaughan, William C. Dement

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Sleep better, live longer with the groundbreaking information and step-by-step program in this revolutionary book.Healthful sleep has been empirically proven to be the single most important factor...

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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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