Elena Choi puts on her mask as she starts kindergarten on the first day of school at the new Hannah Marie Brown Elementary School in Henderson, Nev., Monday, Aug. 9, 2021. Doors opened Monday at schools in and around Las Vegas, where masks were required for the more than 300,000 students and about 18,000 teachers returning to in-person classes at the fifth-largest district in the nation. (Yasmina Chavez/Las Vegas Sun via AP)
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