Gretchen Reynolds Books

Los primeros 20 minutos

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"The New York Times "Phys Ed" columnist counsels casual and serious exercisers on the latest understandings about the mental and physical aspects of a fitness program, sharing recommendations for c...

Los primeros 20 minutos: Sorprendentes hallazgos cientificos revelan como ejercitarnos al maximo, entrenar mejor y vivir mas The First 20 Minutes

By Gretchen Reynolds

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¿Sabías que 20 minutos de cardio al día es suficiente para obtener los máximos beneficios de salud? Cada semana, millones de estadounidenses modifican su rutina de eje...

Yun dong huang jin 20 fen zhong

By Gretchen Reynolds

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The First 20 Minutes Personal Trainer

By Gretchen Reynolds

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A terrific companion to Gretchen Reynolds's New York Times bestseller THE FIRST 20 MINUTES, this Penguin Special features new material and a wealth of perscriptive insight for those looki...

The First 20 Minutes

By Gretchen Reynolds

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The New York Times bestseller that explains how groundbreaking scientific discoveries can help each of us achieve our personal bestEvery week, Gretchen Reynolds single-handedly influences how milli...

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.