Letters to the Editor

  1. Readers discuss Pluto’s planetary status, balding black holes and more

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  2. Readers discuss ‘uniquely human’ DNA and Mars’ volcanic activity

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  3. Readers discuss corn debris biofuel, the color of ancient Mars’ oceans and more

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  4. Readers weigh in on deer-vehicle collisions, mouse sperm in space and more

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  5. Readers discuss the 1921 Tulsa race massacre, zombie fires and more

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  6. Readers weigh in on the Brazil nut effect, clock entropy and more

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  7. Readers react to birds colliding with wind turbines, mysterious muons and more

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  8. Readers weigh in on the ‘USS Jellyfish,’ the new age of videocalling and more

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  9. Readers weigh in on microbes traveling by smoke, ‘Oumuamua and more

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  10. Readers ask about black hole collisions, catnip and more

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  11. Readers react to million-year-old mammoths, parasitic plants and more

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  12. We revisit last year’s COVID-19 questions, readers weigh in on tuataras and more

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