Have you ever wondered what separates people who think bigger from people who set their bars low? What makes one person accept low standards and another person constantly raise them?

Why does one person strive to build an international organization affecting the lives of millions of people while another person is content working her entire life as a clerk? (Not that there's anything wrong with being a clerk!)

Why is one person challenging herself to run marathons, train her body, and get fitter while another is happy living a sedentary, unhealthy lifestyle?

What drives a person who's optimizing every single aspect of her life, and what causes another person to maintain the status quo?

You can say, "Well, the answer is simple enough - one person is ambitious while the other one is not." But what exactly causes it? How do you become more ambitious and think bigger? Is it something you're born with and can't change, or is it something over which you have control?

I found this topic so fascinating, I decided to find out the answer for myself and write a book about it. This book is the result of my research about people who think big and the science of being more ambitious.