His fingers closed around hers—gently, precisely, like a child holding a parent’s hand. He pulled her palm to his cheek and held it there. Then he let out a long, shuddering breath, and his shoulders dropped. The tension he’d carried for three weeks didn’t vanish, but it softened. He leaned his forehead against the mesh and closed his eyes.

Dr. Rodriguez suspected that the troop's behavior might be linked to a underlying medical issue. She began by collecting blood samples from several monkeys, which revealed a surprising finding: many of the monkeys had elevated levels of cortisol, a hormone associated with stress, and low levels of vitamin D.

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