Though Dr. Ryan Earley has flown to coasts off the Caribbean Sea at least once a year for the last seven years, his meccas are not the places most tourists want to see. Instead of lying out on luxurious sandy beaches and swimming in crystal clear water, Earley spends his time knee-deep in the dark sulfured sludge of coastal mangroves—looking for a tiny fighting fish.
According to Earley, the fish, commonly known as the mangrove rivulus, holds some of the keys to understanding variation in individual human aggression and violence—one of society’s greatest mysteries. And with a groundbreaking mirror system that Earley and his doctoral student Cheng-Yu Li developed, the team is equipped better than ever to know what makes humans want to fight.
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