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This week: planet-killing comets, a blood crisis and mask questions answered

By the Numbers

  • 152 million: The film, “Don’t Look Up,” features a metaphor for climate change in the form of a planet-killing comet, plenty of satire and enough science to make scientists happy. It also amassed 152 million hours viewed in a single week.
  • 1 day: It’s National Blood Donor Month, and in recent weeks, the American Red Cross . . .

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