Context and question: DST's potential to save energy comes primarily from its effects on residential lighting, which consumes about 3.5% of electricity in the United States and Canada. Delaying the nominal time of sunset and sunrise reduces the use of artificial light in the evening and increases it in the morning. As Franklin's 1784 satire pointed out, lighting costs are reduced if the evening reduction outweighs the morning increase, as in high-latitude summer when most people wake up well after sunrise. An early goal of DST was to reduce evening usage of incandescent lighting, which used to be a primary use of electricity. Although energy conservation remains an important goal, energy usage patterns have greatly changed since then, and recent research is limited and reports contradictory results. Electricity use is greatly affected by geography, climate, and economics, making it hard to generalize from single studies.
Along with geography and economics, what variable often affects how much electricity an area uses?
Answer: climate
Context and question: Beginning in August, the competition proceeds as a knockout tournament throughout, consisting of twelve rounds, a semi-final and then a final, in May. A system of byes ensures clubs above Level 9 and 10 enter the competition at later stages. There is no seeding, the fixtures in each round being determined by a random draw. Prior to the semi-finals, fixtures ending in a tie are replayed once only. The first six rounds are qualifiers, with the draws organised on a regional basis. The next six rounds are the "proper" rounds where all clubs are in one draw.
What happens when there is a tie after the semi-finals?
Answer: unanswerable
Context and question: An Ancient Chinese document from the 9th century referred to the northern Somali coast which was then called "Berbera" by Arab geographers in reference to the region's "Berber" (Cushitic) inhabitants as Po-pa-li. The first clear written reference of the sobriquet Somali, however, dates back to the 15th century. During the wars between the Sultanate of Ifat based at Zeila and the Solomonic Dynasty, the Abyssinian Emperor had one of his court officials compose a hymn celebrating a military victory over the Sultan of Ifat's eponymous troops.
In what century was the term 'Somali' first used?
Answer:
15th