An intimate and inspirational exploration of Stephen Hawking--the man, the friend, and the physicist.Stephen Hawking was one of the most famous and influential physicists in the world. He left a mark in our culture that touched the lives of millions. His books have inspired countless scientists-to-be, and his research on the laws of black holes and the origin of the universe charted new territory.     Recalling his nearly two-decades as a friend and collaborator with Steph