H. A. Lorentz 
Collected Papers [PDF ebook] 
Volume IX

Curiosity is the nature of every child. "One Hundred Thousand Unpopular Knowledge" focuses on all kinds of bizarre and brain-opening knowledge in life. Through the collection of unpopular k …

What Learning to Fly Is Like: For Those Who Thought or Are Thinking About It but Never Have Jumped on Board offers first-hand advice on a path to becoming a certified pilot. For both the aviation ent …

The On-Site Physical Therapist provides the motivation, steps, and solutions needed to start your own PT practice at a client location. Dr. Christine Mc Callum PT, DPT, spent many years in traditiona …

It’s a busy grandmother-and-granddaughter day! What shall they do together?Grandma explains how to go hopping, skipping, and jumping for fun and exercise. At the end of an active day, they enjoy a fa …

Three friends embark on an action-packed adventure to save the world from two mysterious creatures. This story takes the reader across the universe and is filled with laughter and lots of surprises! …

Freemasonry’s mantra is "making good men better." The principles of Freemasonry, however, are commonly orated in beautiful teachings that are often left open to individual interpretation or …

Could you ever imagine anyone on a school’s staff uttering the words, "I hear you knocking but you can’t come in" to a parent? It seems almost too ridiculous to believe any educator would s …

This book interprets methods for people to achieve personal value enhancement, leapfrogging in quality of life, and cognitive growth in today’s fiercely competitive environment through explanations o …

The so-called alternative data, e refers to non-traditional data. Currently, there is no unified definition of alternative data in this field, but it can be generally understood as data and informati …

Big Mouse is a boy and Little Cat is a girl. They are good friends, not only because Big Mouse is sincere and friendly, but also because Little Cat is kind and pretty. Of course, the most important t …