Don L. Wulffson Books

Amazing True Stories: 9

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A collection of unusual stories that are hard to believe but true, in such categories as "Travel and Transportation," "Crime and Punishment," and "Accidents and Disasters."

Time Fix And Other Tales of Terror

By Don L. Wulffson

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The kid who invented the popsicle

By Don L. Wulffson

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Brief factual stories about how various familiar things were invented, many by accident, from animal crackers to the zipper.

Amazing True Stories

By Don L. Wulffson

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A collection of unusual stories that are hard to believe but true, in such categories as "Travel and Transportation," "Crime and Punishment," and "Accidents and Disasters."

Extraordinary stories behind the invention of ordinary things

By Don L. Wulffson

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Amazing True Stories

By John R. Jones, Don L. Wulffson

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When Human Heads Were Footballs

By Don L. Wulffson

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The Kid Who Invented the Popsicle

By Don L. Wulffson

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Pro Sports

By Don L. Wulffson

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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.