Letters to the Editor

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

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

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

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

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

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

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

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  8. Readers weigh in on brain technology, black holes and more

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  9. Readers react to cosmic smashups and tricky spacecraft landings

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  10. Readers react to the history of plate tectonics, pandas rolling in poop and more

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  11. Readers ask about shrinking toads, defining distance in an expanding universe and more

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  12. Readers ask about malaria parasites, searching for alien intelligence and more

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