The fabrication and characterization of silica-glass optical fibres 1,2 have been developed into a precise art by the telecommunications industry 3,4,5,6. An unintended side effect of this success has ...
Ukrainian President Volodymyr Zelenskiy said on Tuesday Kyiv was discussing with Washington a possible presence of U.S. troops in Ukraine as part of security guarantees, and also raised what he called ...
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