Roman Dial

In the predawn hours of July 10, 2014, the twenty-seven-year-old son of preeminent Alaskan scientist and National Geographic Explorer Roman Dial, walked alone into Corcovado National Park, an untracked rainforest along Costa Rica's remote Pacific Coast that shelters miners, poachers, and drug smugglers. He carried a light backpack and machete. Before he left, Cody Roman Dial emailed his father: "I am not sure how long it will take me, but I'm planning...