Brent Cabahug moved from the Philippines to Minnesota with his mom and sister. He’s a high school senior at Stillwater Area High School, and Walmart is his first job. He’s been saving up to buy a car.

During a shift in late January, an elderly woman came through his checkout line and her card kept declining. The line grew restless. Cabahug walked around the register and paid her $80 grocery bill himself. Then he went back to work.

Another customer in line, a mom of four named Dani Dircks, watched the whole thing happen, as........

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