Swanee Hunt's life has lived up to her Texas-size childhood. Daughter of legendary oil magnate H. L. Hunt, she grew up in a household dominated by an arch-conservative patriarch who spawned a brood of colorful offspring. Her family was nothing if not zealous, and that zeal--albeit for more compassionate causes--propelled her into a mission that reaches around the world. Half-Life of a Zealot tells how the girl who spoke against "Reds" alongside her...