On a sweltering summer afternoon last year, Jacqueline Arellano and James Cordero were out in a desert area on the border between California and Mexico, when they ran into a man in his 60s, who was alone, disoriented and wearing a wool sweater and loafers.
"He'd been lost for three days," says Cordero, "and he'd been going to the top of every nearby mountain, to try to get a better view of where to go, because he couldn't tell which direction was what."
