David De Angelis Books

How I Cured My Myopia

By David De Angelis

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The Secret of Perfect Vision

By David De Angelis

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A revolutionary guide to treating nearsightedness and achieving optimal vision health through exercises that strengthen the eye muscles   Author David De Angelis’s search for a cure for...

COMO ME CURE DE LA MIOPIA

By David De Angelis

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Secret of Perfect Vision

By David De Angelis

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Secret of Perfect Vision

By David De Angelis

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Powerflex Stretching Get Maximum Flexibility In Minimum Time Super Flexibility And Strength For Peak Performance

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Power Flex Stretching

By David De Angelis

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Digiuno Pareto 80 20

By David De Angelis

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The Secret of Perfect Vision

By David De Angelis

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A revolutionary guide to treating nearsightedness and achieving optimal vision health through exercises that strengthen the eye muscles   Author David De Angelis’s search for a cure for...

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.