Five harrowing days after becoming stuck on a remote backcountry road in Death Valley National Park in August 2009, Alicia Sanchez lay down next to her Jeep Cherokee and prepared to die. Then she heard a voice. "I called as I approached, asking if she was okay," wrote Ranger Amber Nattrass in a park report. "She was waving frantically and screaming, 'My baby is dead, my baby is dead.' " In the SUV, Nattrass found Sanchez's lifeless 6-year-old son Carlos on the front seat. "She told me they walked 10 miles but couldn't find any help (and) had run out...