Mastic asphalt is a type of asphalt which differs from dense graded asphalt (asphalt concrete) in that it has a higher asphalt/bitumen (binder) content, usually around 710% of the whole aggregate mix, as opposed to rolled asphalt concrete, which has only around 5% added asphalt/bitumen. This thermoplastic substance is widely used in the building industry for waterproofing flat roofs and tanking underground. Mastic asphalt is heated to a temperature of 210 C (410 F) and is spread in layers to form an impervious barrier about 20 millimeters (0.79 inches) thick.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What is the usual thickness of the mastic spread on roofs?
Ah, so.. 20 millimeters

The monsoon can begin any time from mid-June to late July, with an average start date around July 3. It typically continues through August and sometimes into September. During the monsoon, the humidity is much higher than the rest of the year. It begins with clouds building up from the south in the early afternoon followed by intense thunderstorms and rainfall, which can cause flash floods. The evening sky at this time of year is often pierced with dramatic lightning strikes. Large areas of the city do not have storm sewers, so monsoon rains flood the main thoroughfares, usually for no longer than a few hours. A few underpasses in Tucson have "feet of water" scales painted on their supports to discourage fording by automobiles during a rainstorm. Arizona traffic code Title 28-910, the so-called "Stupid Motorist Law", was instituted in 1995 to discourage people from entering flooded roadways. If the road is flooded and a barricade is in place, motorists who drive around the barricade can be charged up to $2000 for costs involved in rescuing them. Despite all warnings and precautions, however, three Tucson drivers have drowned between 2004 and 2010.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When does Tucson's monsoon usually start?
Ah, so.. around July 3

The use of the term Middle East as a region of international affairs apparently began in British and American diplomatic circles quite independently of each other over concern for the security of the same country: Iran, then known to the west as Persia. In 1900 Thomas Edward Gordon published an article, The Problem of the Middle East, which began:
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When did Thomas Edward Gordon publish "The Problem of the Middle East"?
Ah, so..
1900