John S. Friedman Books

The Secret Histories

By John S. Friedman

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Out of the Blue A History of Lightning

By John S. Friedman, John Friedman

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First Harvest

By John Friedman

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The Healer

By Primm M.D. Beny J. Friedman John S.

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Out of the Blue

By John S. Friedman

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The odds of being hit by lightning each year are only about 1 in 750,000 in the U.S. And yet this rare phenomenon has inspired both fear and fascination for thousands of years. In this groundbreaki...

Out of the Blue: A History of Lightning: Science, Superstition, and Amazing Stories of Survival

By John Friedman

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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.