Mientras Xi Jinping se reunía con los líderes de Rusia e Irán, Europa desafió al gobierno de Trump en el G20, lo que ofreció una visión en pantalla dividida de un mundo cambiante. Por David Pierson El ...
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Two-dimensional materials are substances with a thickness of a few nanometres or less. Electrons in these materials are free to move in the two-dimensional plane, but their restricted motion in the ...
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