"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 must-read book for anyone striving to succeed, pioneering psychologist Angela Duckworth shows parents, educators, students, and business people both seasoned and new that the secret to outstanding achievement is not talent but a focused persistence called grit.