Jack Challoner Books

An introduction to the concept of size, describing how sizes are measured, comparing sizes of such things as plants, animals, and buildings, and providing related activities.

Fast and slow

By Jack Challoner

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A basic introduction to the concept of speed with illustrative experiments.

Light and dark

By Jack Challoner

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Simple activities introduce light in relation to day and night, the sun and the stars, shadows, black and white, and more.

Wet and dry

By Jack Challoner

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Simple activities introduce water in relation to clouds, rain, rivers, plants, and more.

Hot and cold

By Jack Challoner

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Simple activities introduce the concepts of hot and cold in relation to melting and freezing, temperature, deserts and polar areas, and more.

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.