For centuries, biographers have relied on letters to bring historical figures to life, whether Gandhi or Catherine the Great. But as people switch from writing on paper to documenting their lives electronically, biographers are encountering new benefits - and new challenges.
Walter Isaacson's authorized biography of Apple co-founder Steve Jobs is based on dozens of interviews. But one of the book's juiciest episodes comes from a string of emails from 2003. That's when Apple launched the iTunes music store. Right away, the company's rivals at Microsoft understood this could be a game changer.