Sonam Wangchuk, a longtime activist, has fasted for 19 days, joining forces with a student-led campaign to change India’s education system.

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Congressional interns, usually seen but not heard, are taking to social media with viral trends and pithy posts about their outfits, lifestyles and jobs.

Melat Kiros’s challenge Tuesday to Representative Diana DeGette, who was elected the year before Ms. Kiros was born, is the latest Gen Z test in a year defined by generational upheaval.

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