Robert Friedhoffer Books

How to haunt a house for Halloween

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Provides tips on how to create a haunted house at home and instructions for performing magic tricks at a Halloween party.

Magic tricks, science facts

By Robert Friedhoffer

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Presents several magic tricks based on principles of physics, math, chemistry, and physiology.

More magic tricks, science facts

By Robert Friedhoffer

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Presents several magic tricks that demonstrate principles of mathematics, biology, chemistry, and physics.

Matter and energy

By Robert Friedhoffer

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Experiments, magic tricks, and other activities explore the scientific principles of matter and energy.

Forces, motion, and energy

By Robert Friedhoffer

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Experiments, magic tricks, and other activities explore the scientific principles of force, motion, and energy.

Molecules and heat

By Robert Friedhoffer

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Experiments, magic tricks, and other activities explore the scientific principles of molecules and heat.

Light

By Robert Friedhoffer

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Experiments, magic tricks, and other activities explore the scientific principles of light.

Sound

By Robert Friedhoffer

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Experiments, magic tricks, and other activities explore the scientific principles of sound.

Magnetism and electricity

By Robert Friedhoffer

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This sixth volume in a six-volume series of books using magic tricks and activities to illustrate scientific principles features experiments with magnetism and electricity.

Toying around with science

By Robert 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.