Robert Friedhoffer Books

Magic and perception

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Presents step-by-step instructions for a variety of magic tricks, explaining how the tricks work by affecting people's perceptions.

Physics lab in a hardware store

By Robert Friedhoffer

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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.

Science Lab in a Supermarket

By Robert Friedhoffer

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Presents a variety of experiments using items you can buy in the supermarket. Also explains the scientific basis for such things as the flexible plastic strips that cover doorways leading into the...

Old Magic Meets Today s Science

By Robert Friedhoffer

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How to haunt a house for halloween

By Harriet Friedhoffer

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How to Haunt a House for Halloween Halloween Book

By Robert Friedhoffer

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Toying around with science

By Robert Friedhoffer

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Magic and Perception

By Robert Friedhoffer

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Physics Lab in a Hardware Store Physical Science Labs

By Bob Friedhoffer

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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.