Problem: Philadelphia:

During the last decade, Philadelphia experienced a large shift in its age profile. In 2000, the city's population pyramid had a largely stationary shape. In 2013, the city took on an expansive pyramid shape, with an increase in the three millennial age groups, 20 to 24, 25 to 29, and 30 to 34. The city's 25- to 29-year-old age group was the city's largest age cohort. According to the 2010 Census, 343,837 (22.5%) were under the age of 18; 203,697 (13.3%) from 18 to 25; 434,385 (28.5%) from 25 to 44; 358,778 (23.5%) from 45 to 64; and 185,309 (12.1%) who were 65 years of age or older. The median age was 33.5 years. For every 100 females there were 89.4 males. For every 100 females age 18 and over, there were 85.7 males. The city had 22,018 births in 2013, down from a peak 23,689 births in 2008. Philadelphia's death rate was at its lowest in at least a half-century, 13,691 deaths in 2013. Another factor attributing to the population increase is Philadelphia's immigration rate. In 2013, 12.7 percent of residents were foreign-born, just shy of the national average, 13.1 percent.

How many deaths were there in 2013?
---
A: 13,691


Problem: There is a strong relationship between the properties of wood and the properties of the particular tree that yielded it. The density of wood varies with species. The density of a wood correlates with its strength (mechanical properties). For example, mahogany is a medium-dense hardwood that is excellent for fine furniture crafting, whereas balsa is light, making it useful for model building. One of the densest woods is black ironwood.
What property of wood varies according to species?
---
Answer: density


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In 1906, the tungsten filament was introduced. Tungsten metal was initially not available in a form that allowed it to be drawn into fine wires. Filaments made from sintered tungsten powder were quite fragile. By 1910, a process was developed by William D. Coolidge at General Electric for production of a ductile form of tungsten. The process required pressing tungsten powder into bars, then several steps of sintering, swaging, and then wire drawing. It was found that very pure tungsten formed filaments that sagged in use, and that a very small "doping" treatment with potassium, silicon, and aluminium oxides at the level of a few hundred parts per million greatly improved the life and durability of the tungsten filaments.
What other materials were combined with tungsten?
A: potassium, silicon, and aluminium oxides


Context and question: Railway Himachal is famous for its narrow gauge tracks railways, one is UNESCO World Heritage Kalka-Shimla Railway and another one is Pathankot–Jogindernagar. Total length of these two tracks is 259 kilometres (161 mi). Kalka-Shimla Railway track passes through many tunnels, while Pathankot–Jogindernagar gently meanders through a maze of hills and valleys. It also has standard gauge railway track which connect Amb (Una district) to Delhi. A survey is being conducted to extend this railway line to Kangra (via Nadaun). Other proposed railways in the state are Baddi-Bilaspur, Dharamsala-Palampur and Bilaspur-Manali-Leh.
What are the other railways being proposed in the state?
Answer: Baddi-Bilaspur, Dharamsala-Palampur and Bilaspur-Manali-Leh.


Question: With increasing environmental concerns about synthetic coatings (such as PFOA) and the higher prices of hydrocarbon based petrochemicals, there is a focus on zein (corn protein) as a coating for paper in high grease applications such as popcorn bags.
Is there an answer to this question: What is another term for synthetic protein?

Answer: unanswerable


Question: Founded by Dantidurga around 753, the Rashtrakuta Empire ruled from its capital at Manyakheta for almost two centuries. At its peak, the Rashtrakutas ruled from the Ganges River and Yamuna River doab in the north to Cape Comorin in the south, a fruitful time of political expansion, architectural achievements and famous literary contributions.[citation needed] The early kings of this dynasty were Hindu but the later kings were strongly influenced by Jainism. Govinda III and Amoghavarsha were the most famous of the long line of able administrators produced by the dynasty. Amoghavarsha, who ruled for 64 years, was also an author and wrote Kavirajamarga, the earliest known Kannada work on poetics. Architecture reached a milestone in the Dravidian style, the finest example of which is seen in the Kailasanath Temple at Ellora. Other important contributions are the sculptures of Elephanta Caves in modern Maharashtra as well as the Kashivishvanatha temple and the Jain Narayana temple at Pattadakal in modern Karnataka, all of which are UNESCO World Heritage Sites. The Arab traveler Suleiman described the Rashtrakuta Empire as one of the four great Empires of the world. The Rashtrakuta period marked the beginning of the golden age of southern Indian mathematics. The great south Indian mathematician Mahāvīra (mathematician) lived in the Rashtrakuta Empire and his text had a huge impact on the medieval south Indian mathematicians who lived after him. The Rashtrakuta rulers also patronised men of letters, who wrote in a variety of languages from Sanskrit to the Apabhraṃśas.
Is there an answer to this question: What was the faith of the early rulers of the Rastrakuta Empire?

Answer:
Hindu