Opsopaus PhD, John Books

The Oracles Of Apollo: Practical Ancient Greek Divination For Today

By John Opsopaus, John Opsopaus PhD, Opsopaus PhD, John

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Throughout history, divination has been an important tool for seeking guidance from the gods. Fortunately, several classical divination systems are available to us again today. The Oracles of Apoll...

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.