Bob Friedhoffer Books

Physics lab in a hardware store

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Examines such topics in physics as mass, weight, gravity, buoyancy, and pressure with experiments using common household tools.

Physics lab in the home

By Robert Friedhoffer

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Explores such topics in physics as the properties of water, transmission of heat, evaporation, and air pressure as seen in home plumbing, refrigerators, and other common items.

Physics Lab in a Hardware Store Physical Science Labs

By Bob Friedhoffer

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Science Lab in a Supermarket

By Friedhoffer Bob Friedhoffer Robert

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Physics Lab in the Home Physical Science Labs

By Bob Friedhoffer

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Physics Lab in a Housewares Store Physical Science Labs

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Physics Lab in the Home

By Bob Friedhoffer

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Science Lab in a Supermarket

By Bob Friedhoffer

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Everything you need for Simple Science Fair Projects

By Bob Friedhoffer

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Scientific American

By Salvatore Tocci

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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.