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    • Pregnancy Test using the Male Toad - Nature

      Nature· 2 days ago

      ...Lima and Oswaldo Gelli Pereira, of the Obstetrical Clinic, Medical School of Rio de Janeiro, University of Brazil, state in a communication submitted to the Editors that they have confirmed this work, using as test animal the male toad (Bufo marinus), as the species used by Mainini was not...

    • [Letters to the Editors] - Nature

      Nature· 2 days ago

      The “vast independent universe of concrete machinery” had not only established itself in the mind of the physicist of those days as independent, but also it was endangering the independence ...