Thomas Hager Books

The demon under the microscope

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The Nazis discovered it. The Allies won the war with it. It conquered diseases, changed laws, and single-handedly launched the era of antibiotics. It was sulfa, the first synthetic antibiotic. Scie...

The Demon Under the Microscope

By Thomas Hager

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In The Demon Under the Microscope, Thomas Hager chronicles the dramatic history of sulfa, the first antibiotic and the drug that shaped modern medicine. The Nazis discovered it. The Allies won th...

The Demon Under the Microscope

By Thomas Hager

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Electric City

By Thomas Hager

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Ten Drugs

By Thomas Hager

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Ten Drugs

By Thomas Hager, Angelo Di Loreto

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Hwahak hyokmyong kwa P olling

By Thomas Hager

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The Alchemy of Air

By Thomas Hager

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A sweeping history of tragic genius, cutting-edge science, and the Haber-Bosch discovery that changed billions of lives—including your own. At the dawn of the twentieth century, humanity was facing...

The alchemy of air

By Thomas Hager

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Feeding a hungry world

By Thomas Hager

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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.