Letters to the Editor

  1. Readers discuss black holes’ trippy effects on time, banned swimsuits

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  2. Readers discuss hypothetical ‘tauonium’ atoms

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  3. Readers ponder sign language in ancient humans, looped universe

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  4. Readers ask about noise pollution and beluga melons

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  5. Readers discuss dark energy, Ötzi’s tattoos and sneaky plant invasions

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  6. Readers react to a rare visual disorder, microplastics in arteries and more

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  7. Readers discuss accessible images in print and potassium’s climate potential

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  8. Readers consider medical privacy, where sharks rank in food webs

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  9. Readers discuss Mimas’ hidden ocean and ancient cave art

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  10. Readers discuss ancient plagues and a fern’s leaf revival

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  11. Readers discuss tardigrades, poison dart frogs and more

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  12. Readers discuss cholesterol treatments and AI

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