Input: Railway electrification system
Most electrification systems use overhead wires, but third rail is an option up to about 1,200 V. Third rail systems exclusively use DC distribution. The use of AC is not feasible because the dimensions of a third rail are physically very large compared with the skin depth that the alternating current penetrates to (0.3 millimetres or 0.012 inches) in a steel rail). This effect makes the resistance per unit length unacceptably high compared with the use of DC. Third rail is more compact than overhead wires and can be used in smaller-diameter tunnels, an important factor for subway systems.

What is physically more compact tird rail or overhead wires?
Output: Third rail

Input: Article: In 2006, crime in Santa Monica affected 4.41% of the population, slightly lower than the national average crime rate that year of 4.48%. The majority of this was property crime, which affected 3.74% of Santa Monica's population in 2006; this was higher than the rates for Los Angeles County (2.76%) and California (3.17%), but lower than the national average (3.91%). These per-capita crime rates are computed based on Santa Monica's full-time population of about 85,000. However, the Santa Monica Police Department has suggested the actual per-capita crime rate is much lower, as tourists, workers, and beachgoers can increase the city's daytime population to between 250,000 and 450,000 people.

Now answer this question: In 2006 what was crime mostly comprised of?

Output: property

Article: Spring 1989 saw the people of the Soviet Union exercising a democratic choice, albeit limited, for the first time since 1917, when they elected the new Congress of People's Deputies. Just as important was the uncensored live TV coverage of the legislature's deliberations, where people witnessed the previously feared Communist leadership being questioned and held accountable. This example fueled a limited experiment with democracy in Poland, which quickly led to the toppling of the Communist government in Warsaw that summer which in turn sparked uprisings that overthrew communism in the other five Warsaw Pact countries before the end of 1989, the year the Berlin Wall fell. These events showed that the people of Eastern Europe and the Soviet Union did not support Gorbachev's drive to modernize Communism; rather, they preferred to abandon it altogether.

Question: Who was questioned on live TV?
Ans: Communist leadership

Here is a question about this article: However, the army was hopeless in battle against the western forces, particularly against the young Mahmud of Ghazni. In the year 1001, soon after Sultan Mahmud came to power and was occupied with the Qarakhanids north of the Hindu Kush, Jaipal attacked Ghazni once more and upon suffering yet another defeat by the powerful Ghaznavid forces, near present-day Peshawar. After the Battle of Peshawar, he committed suicide because his subjects thought he had brought disaster and disgrace to the Shahi dynasty.
What is the answer to this question: Upon what did Jaipal's subjects think he brought disaster?
****
So... Shahi dynasty

The problem: Answer a question about this article:
In 1979, the U.S. placed Libya on its list of "State Sponsors of Terrorism", while at the end of the year a demonstration torched the U.S. embassy in Tripoli in solidarity with the perpetrators of the Iran hostage crisis. The following year, Libyan fighters began intercepting U.S. fighter jets flying over the Mediterranean, signalling the collapse of relations between the two countries. Libyan relations with Lebanon and Shi'ite communities across the world also deteriorated due to the August 1978 disappearance of imam Musa al-Sadr when visiting Libya; the Lebanese accused Gaddafi of having him killed or imprisoned, a charge he denied. Relations with Syria improved, as Gaddafi and Syrian President Hafez al-Assad shared an enmity with Israel and Egypt's Sadat. In 1980, they proposed a political union, with Libya paying off Syria's 1 billion debt to the Soviet Union; although pressures led Assad to pull out, they remained allies. Another key ally was Uganda, and in 1979, Gaddafi sent 2,500 troops into Uganda to defend the regime of President Idi Amin from Tanzanian invaders. The mission failed; 400 Libyans were killed and they were forced to retreat. Gaddafi later came to regret his alliance with Amin, openly criticising him.
What list did the United States add Libya to in 1979?
****
The answer: State Sponsors of Terrorism

The problem: Answer a question about this article:
Before Prince Albert's death, the palace was frequently the scene of musical entertainments, and the greatest contemporary musicians entertained at Buckingham Palace. The composer Felix Mendelssohn is known to have played there on three occasions. Johann Strauss II and his orchestra played there when in England. Strauss's "Alice Polka" was first performed at the palace in 1849 in honour of the queen's daughter, Princess Alice. Under Victoria, Buckingham Palace was frequently the scene of lavish costume balls, in addition to the usual royal ceremonies, investitures and presentations.
Which composer played at Buckingham on three occasions?
****
The answer:
Felix Mendelssohn