Jack Challem Books

Syndrome X

By Burton Berkson, Jack Challem, Melissa Diane Smith

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No more fatigue

By Jack Challem

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"A complete program to overcome a new epidemic-The Fatigue Syndrome Do you feel exhausted, rundown, and stressed-out all the time? Do you have trouble sleeping well at night and wake up feeling...

Food Mood Solution

By Jack Challem, Melvyn R. Werbach

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The Inflammation Syndrome

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Completely revised and updated-Jack Challem's powerful plan to safely prevent and overcome inflammatory disorders Inflammation is what happens when our body's own defenses turn on us-and it is a h...

The Inflammation Syndrome

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Completely revised and updated-Jack Challem's powerful plan to safely prevent and overcome inflammatory disorders Inflammation is what happens when our body's own defenses turn on us-and it is a h...

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

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.