Bettmann / Contributor
- Albert Einstein's most iconic photo of him sticking out his tongue was almost lost to history.
- Editors hesitated to release it because they feared the expression downplayed his eminence.
- Author Mike Rucker explains how Einstein's fun and curious nature played to his greatness.
The following is an excerpt from Mike Rucker's new book, "The Fun Habit: How the Pursuit of Joy and Wonder Can Change Your Life."