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The main factors behind the low efficiency were depletion of water sources , breakdowns of water intake systems , stolen parts , and damaged pipes . The notion of spectral curve was first introduced in the sixties , in the theory of integrable systems . The log sheet identified the exemptions the city claimed for each record but not specific exemptions justifying withholding of each piece of information . As Kaitlan Deikson , of Manvel School , in North Dakota , writes : It all started when my mom woke me up and said we have to evacuate . On the " knowledge " side of the debate I found it ironically amusing that the day before the BBC news article appeared , I received my copy of The American Educator , a magazine published by the American Federation of Teachers .