William R. Wellnitz Books

Science in your backyard

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Includes experiments involving plants, animals, and earth sciences that can be done close to home and that encourage the development of observation and measurement skills.

Science magic for kids

By William R. Wellnitz

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Summary, Over sixty science experiments test the properties of colors, food, air, soap bubbles, heat, light, plants, and magnets.

Be a kid physicist

By William R. Wellnitz

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Presents experiments that use materials found around the home and explore the principles of light, electricity, magnetism, motion, heat, and sound.

Homemade slime and rubber bones!

By William R. Wellnitz

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Presents simple experiments and other science activities which use items readily available in the home.

Science magic for kids

By William R. Wellnitz

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Summary, Over sixty science experiments test the properties of colors, food, air, soap bubbles, heat, light, plants, and magnets.

Microorganisms in Our World

By William R. Wellnitz, Ronald M. Atlas

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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.