David Feldman Books

Why Do Clocks Run Clockwise? And Other Imponderables: Mysteries Of Everyday Life Explained

By David Feldman, Feldman, David, Kas Schwan

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Here are the answers to questions that have been keeping you and your loved ones up nights, questions that have driven families to feuds, questions that nag and nag just won't let go. Have you ever...

When Do Fish Sleep: And Other Imponderables Of Everyday Life

By David Feldman, Feldman, David, Kassie Schwan

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Ponder, if you will ...Why are tennis balls fuzzy? How come birds don't tip over when they sleep on telephone wires?What makes yawning contagious?Why, oh why, do roosters have to crow so early in t...

Why Do Dogs Have Wet Noses?: And Other Inponderables Of Everyday Life

By David Feldman, Feldman, David

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Do Penguins Have Knees?: An Imponderables Book

By David Feldman, Feldman, David, Kassie Schwan

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Author Humorously Answers Civilization's Most Perplexing Questions And Darkest Mysteries Known To Humankind. David Feldman ; Illustrated By Kassie Schwan. A Hardcover Edition Of This Book Was Publi...

When Did Wild Poodles Roam The Earth?: An Imponderables Book

By David Feldman, Feldman, David

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How Does Aspirin Find A Headache?: An Imponderables Book

By David Feldman, Feldman, David

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Do Elephants Jump?

By David Feldman, Feldman, David

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Every day, we are confronted with innumerable small mysteries that puzzle and confound. Why do pianos have 88 keys? Why is peanut butter sticky? And do elephants jump? Now David Feldman returns wit...

Do Elephants Jump? (Imponderables Books) (Imponderables Series)

By David Feldman

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ponder, If You Will ... Where Do You Find Fascinating Explanations For A Multitude Of Mysteries? Why Do Pianos Have 88 Keys? How Does The Hole Get In The Needle Of A Syringe? Why Is Peanut Butter...

Do Penguins Have Knees? An Imponderables Book

By David Feldman, Feldman, David

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Ponder, if you will What happens to your Social Security number when you die? Why are peanuts listed as an ingredient in plain M&Ms? Why is Barbie's hair made out of nylon, but Ken's hair is plasti...

When Do Fish Sleep? : An Imponderables Book

By David Feldman, Feldman, David

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ponder, If You Will ... Why Are Tennis Balls Fuzzy? How Come Birds Don't Tip Over When They Sleep On Telephone Wires? What Makes Yawning Contagious? Why, Oh Why, Do Roosters Have To Crow So Early...

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.