Tim Harkins Books

Gross science experiments

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A collection of slippery, slimy, or freaky experiments, grouped by the odors they secrete, the sickening sounds they make, or the yucky way they feel, taste, or look.

Batman Adventures: Riddle Me This!

By Scott Peterson

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When is a Riddle not a Riddler?Riddle me this, Robin!Who sings for Nightwing?Friend or foe? The Riddler. He’s a constant thorn in Batman and Robin’s side who always teases the Cape...

Running with Water

By V Press LC, Elizabeth Buttimer, Rowe Carenen, Milton Bates, Derek Berry

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Gotham Adventures

By Tim Harkins, Lee Loughridge, Ty Templeton, Terry Beatty, Rick Burchett

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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.