Jens Olesen Books

Chicken and egg

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Photographs, drawings, and text on two different levels of difficulty follow the development of a chick embryo from the fertilization and laying of the egg to the time the chick hatches.

Chicken and Egg Stopwatch Books

By Christine Back, Jens Olesen

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Snail Stopwatch Books

By Jens Olesen, Barrie Watts

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Bumblebee Stopwatch Books

By Jens Olesen, Bo Jarner

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Snail Stopwatch Books

By Jens Olesen, Barrie Watts

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Chicken and Egg Stopwatch Big Books

By Christine Back, Jens Olesen

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Normal people do not work in advertising

By Jens Olesen

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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.