There's a linked article about the hunt for ideal glass that includes some details about 'two-level systems'. [1] [1] https://www.quantamagazine.org/ideal-glas

There's a linked article about the hunt for ideal glass that includes some details about 'two-level systems'. [1] [1] https://www.quantamagazine.org/ideal-glass-would-explain-why-glass-exists-at-all-20200311/ https://www.quantamagazine.org/ideal-glass-would-explain-why...