Readers ask about buoyancy, Stonehenge sounds and more

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Rock the boat Scientists made a toy boat float upside down on the bottom of a layer of levitating liquid, Maria Temming reported in “Toy boats defy gravity by floating upside down” (SN: 9/26/20, p. 32). “I was quite intrigued by the upside-down boat. The explanation of buoyancy versus gravity does… […]

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Readers ask about positronium, wild bees and more

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Dance of the doomed particles Scientists are puzzled by an unexpectedly large gap in the energy levels of an exotic “atom” called positronium, which consists of an electron and a positron, Emily Conover reported in “Positronium result baffles physicists” (SN: 9/12/20, p. 14). Reader Lee Skinner asked why the electron and… […]

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