Nick Castro Books

Que Pasa Por Alla Abajo What s Going on Down There

By Karen Gravelle, Chava Castro, Nick Castro

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What's Going on Down There?: A Boy's Guide to Growing Up

By Robert Leighton, Karen Gravelle, Chava Castro, Nick Castro, Walker Co

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What's going on down there?

By Karen Gravelle

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Describes the physical and emotional changes that occur in boys (and, to a lesser extent, in girls) during puberty and discusses sexual activity, homosexuality, AIDS, and other related topics.

S.O.S Hablemos de Sexo Soy un Adolescente

By Karen Gravelle, Nick Castro

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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.