Pengjie Zhang Books

Searching for missing baryons.

By Pengjie Zhang

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Shou huang hou

By Pengjie Zhang

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Concerned about the overweight King and skinny Queen. One day, the Queen was so weak and fainted. The doctor told her that she needed a rest and adopted a balanced diet. In order to help the Queen...

Yan jing gong zhu

By Pengjie Zhang, Peng Jie Zhang

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The princess has some vision problems and has to wear eyeglasses. With the help of doctor, cook and her parents, she finally regains her perfect vision and no longer needs eyegalsses.

Zhu ya wang zi

By Pengjie Zhang

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The prince has some cavities in his teeth. With the help of doctor, cook and her parents, he has finally learned how to take care of his teeth.

Ha jiu xiao wang zi

By Pengjie Zhang

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"The little Prince often sneezed, and was nicknamed "Ah-choo Prince". One day, he caught a cold. The Royal family followed the doctor's order and helped "Ah-choo Prince" get well. But who would hav...

Pang guo wang

By Pengjie Zhang

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Once there was a fat king. He was so fat that he couldn't do anything and felt ill most of the time. One day, his doctor, his cook, the princess and the queen urged him to start working out and goi...

Cai se dou

By Pengjie Zhang

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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.