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    • Velocity of Sound in Air at Low Pressures - Nature

      Nature· 10 hours ago

      Because of the meteorological significance of these observations and their implication in supersonic aerodynamics, we have carried out a new determination of the velocity of sound in air at pressures down to 5 mm.

    • Dispersibility of Coal in a Supersonic Field - Nature

      Nature· 12 hours ago

      /sec.) for 15 min. When the extract thus formed was recovered by removal of the solvent under reduced pressure in an atmosphere of dry oxygen-free nitrogen, it formed a black, free-running solid ...

    • Verifying Telephone Subscribers' Numbers - Nature

      Nature· 12 hours ago

      To avoid the incorrect recording of callers' numbers in a trunk exchange associated with an automatic telephone area, various expedients have been adopted, including the reversion of a certain ...

    • Opinion | What Democrats Need to Do Now

      Opinion | What Democrats Need to Do Now

      New York Times· 19 hours ago

      In 2016, MAGA was just a slogan — or at best a spasm of resentments and instincts about issues like immigration. Over the last eight years, think...