the department of energy tells us that, "a cool roof under the same conditions could stay more than 50°f cooler and save energy and money by using less air conditioning." they had been created in the 1360s. you don't have to stand there and wait for people to come, because they won't. the measures have cost the government about $3.7 billion per year. other extras will be made available whenever possible. in 2017, he directed "the final problem", the last episode of the fourth series of sherlock. the original local consistency conditions require that every consistent assignment can be consistently extended to another variable. 