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" A case in point : The recent US-Russian agreement in which both sides agree to give 24 hours ' notice of a large missile launch . On the whole I tend to agree with Lubos ’ opinion of the intellectual merits of LQG ... DOT also found that when participation rates in a DOT-sponsored program are high , such as participation in the used tire recycling days , the respondents ' rating of the importance of that same activity is equally high . He proposed the so-called ‘ instanton liquid ’ model of the QCD vacuum , considering the “ vacuum ” ( ground state ) as an ensemble of interacting non-linear fluctuations called instantons . While the students ' completion of the model would be tangible proof of some forms of mastery , the specific goals of content understanding also needed to be addressed along the way .