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    • Transverse Markings in Strained Fibres - Nature

      Nature· 1 day ago

      EVIDENCE has recently accumulated showing that when fibres of materials as chemically diverse as cellulose, polyamide, polyester, polyethylene and polypropylene are submitted to tensile strain ...

    • Helium in Natural Gas in the Witwatersrand - Nature

      Nature· 1 day ago

      DURING a visit to the Union of South Africa in the spring of 1957 I observed escapes of natural gas associated with faults and fissures in the underground workings of some of the gold–uranium mines of the Witwatersrand.