Problem: In the former Soviet Union, electric traction eventually became somewhat more energy-efficient than diesel. Partly due to inefficient generation of electricity in the USSR (only 20.8% thermal efficiency in 1950 vs. 36.2% in 1975), in 1950 diesel traction was about twice as energy efficient as electric traction (in terms of net tonne-km of freight per kg of fuel). But as efficiency of electricity generation (and thus of electric traction) improved, by about 1965 electric railways became more efficient than diesel. After the mid 1970s electrics used about 25% less fuel per ton-km. However diesels were mainly used on single track lines with a fair amount of traffic  so that the lower fuel consumption of electrics may be in part due to better operating conditions on electrified lines (such as double tracking) rather than inherent energy efficiency. Nevertheless, the cost of diesel fuel was about 1.5 times more (per unit of heat energy content) than that of the fuel used in electric power plants (that generated electricity), thus making electric railways even more energy-cost effective.
What could be a factor of lower energy consumption for electric trains?
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Answer: better operating conditions on electrified lines


Problem: Civil strife in the early 1990s greatly increased the size of the Somali diaspora, as many of the best educated Somalis left for the Middle East, Europe and North America. In Canada, the cities of Toronto, Ottawa, Calgary, Edmonton, Montreal, Vancouver, Winnipeg and Hamilton all harbor Somali populations. Statistics Canada's 2006 census ranks people of Somali descent as the 69th largest ethnic group in Canada.
As of 2006, where did Somalis rank in terms of population by ethnicity in Canada?
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Answer: 69th


Problem: The city's location was chosen, in part, for being within 11 mi (18 km) of Isaac Hunter's Tavern, a popular tavern frequented by the state legislators. No known city or town existed previously on the chosen city site. Raleigh is one of the few cities in the United States that was planned and built specifically to serve as a state capital. Its original boundaries were formed by the downtown streets of North, East, West and South streets. The plan, a grid with two main axes meeting at a central square and an additional square in each corner, was based on Thomas Holme's 1682 plan for Philadelphia.
What is the opposite of a grid system?
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Answer:
unanswerable