Roy A. Gallant Books

Discusses what is currently known about memory and how it works, and makes suggestions for improving one's memory through mnemonic techniques and proper organization.

The planets, exploring the solar system

By Roy A. Gallant

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Discusses the planets, moons, sun, asteroids, meteoroids, and comets of the solar system, their features and movements, and man's exploration of them.

Rainbows, Mirages, and Sundogs

By Roy A. Gallant

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Discusses and explains visual phenomena seen in the sky, primarily interactions of light and atmosphere such as rainbows, mirages, the twinkling of stars, the blue color of the sky, and the Norther...

The PRIVATE LIVES OF THE STARS

By Roy A. Gallant

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Discusses the major classes of stars and describes how they are created, how they change, and what eventually happens to them.

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.