Helene Courtois Books

Finding Our Place in the Universe

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How a team of researchers, led by the author, discovered our home galaxy's location in the universe.You are here: on Earth, which is part of the solar system, which is in the Milky Way galaxy, whic...

Astrophysique Rappels de cours exercices et problemes corriges

By Helene Courtois, Agnes Acker

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Finding Our Place in the Universe

By Nikki Kopelman, Helene Courtois

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An astrophysicist recounts how her team of researchers surfed the cosmos to map our local universe—and discovered the Laniakea supercluster, home of the Milky Way. You are here: on Earth, which i...

Finding Our Place in the Universe

By Helene Courtois, Nikki Kopelman

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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.