"What is the book that changed your life? (not novels or religious texts)"
I think it's a wonderful way to connect in a less superficial way and learn a little more about each other. It's also a wonderful way to discover new books worth reading.
This is one of them (the full list is here):
In this book, Robert Greene demonstrates that the ultimate form of power is mastery itself. By analyzing the lives of such past masters as Charles Darwin, Benjamin Franklin, Albert Einstein, and Leonard da Vinci, as well as by interviewing nine contemporary masters, including tech guru Paul Graham and animal rights advocate Temple Grandin, Greene debunks our culture’s many myths about genius and distills the wisdom of the ages to reveal the secret to greatness. With this seminal text as a guide, readers will learn how to unlock the passion within and become masters.