Problem: Please answer a question about the following article about Incandescent light bulb:
One of the problems of the standard electric light bulb is filament notching due to evaporation of the filament. Small variations in resistivity along the filament cause "hot spots" to form at points of higher resistivity; a variation of diameter of only 1% will cause a 25% reduction in service life. These hot spots evaporate faster than the rest of the filament, which increases the resistance at that point—this creates a positive feedback that ends in the familiar tiny gap in an otherwise healthy-looking filament. Irving Langmuir found that an inert gas, instead of vacuum, would retard evaporation. General service incandescent light bulbs over about 25 watts in rating are now filled with a mixture of mostly argon and some nitrogen, or sometimes krypton. Lamps operated on direct current develop random stairstep irregularities on the filament surface which may cut lifespan in half compared to AC operation; different alloys of tungsten and rhenium can be used to counteract the effect.
Which type of alloys can decrease "stairstep" irregularities in light bulb filaments?
A: alloys of tungsten and rhenium


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In the late nineteenth century, two black Congressmen were elected from North Carolina's 2nd district, the last in 1898. George Henry White sought to promote civil rights for blacks and to challenge efforts by white Democrats to reduce black voting by new discriminatory laws. They were unsuccessful. In 1900, the state legislature passed a new constitution, with voter registration rules that disfranchised most blacks and many poor whites. The state succeeded in reducing black voting to zero by 1908. Loss of the ability to vote disqualified black men (and later women) from sitting on juries and serving in any office, local, state or federal. The rising black middle-class in Raleigh and other areas was politically silenced and shut out of local governance, and the Republican Party was no longer competitive. It was not until after federal civil rights legislation was passed in the mid-1960s that the majority of blacks in North Carolina would again be able to vote, sit on juries and serve in local offices. No African American was elected to Congress until 1992.

When was the last time two black congressmen were elected?
Answer: 1898


Problem: On April 20, 2011, Sony shut down the PlayStation Network and Qriocity for a prolonged interval, revealing on April 23 that this was due to "an external intrusion on our system". Sony later revealed that the personal information of 77 million users might have been taken, including: names; addresses; countries; email addresses; birthdates; PSN/Qriocity logins, passwords and handles/PSN online IDs. They also stated that it was possible that users' profile data, including purchase history and billing address, and PlayStation Network/Qriocity password security answers may have been obtained. There was no evidence that any credit card data had been taken, but the possibility could not be ruled out, and Sony advised customers that their credit card data may have been obtained. Additionally, the credit card numbers were encrypted and Sony never collected the three digit CVC or CSC number from the back of the credit cards which is required for authenticating some transactions. In response to the incident, Sony announced a "Welcome Back" program, 30 days free membership of PlayStation Plus for all PSN members, two free downloadable PS3 games, and a free one-year enrollment in an identity theft protection program.
What did Sony call the special offer they handed out to respond to the breach?
The answer is the following: "Welcome Back"


The only extant depiction of Edward's abbey, together with the adjacent Palace of Westminster, is in the Bayeux Tapestry. Some of the lower parts of the monastic dormitory, an extension of the South Transept, survive in the Norman undercroft of the Great School, including a door said to come from the previous Saxon abbey. Increased endowments supported a community increased from a dozen monks in Dunstan's original foundation, up to a maximum about eighty monks, although there was also a large community of lay brothers who supported the monastery's extensive property and activities.
How was the community able to increase?
endowments


Input: Sino-Tibetan relations during the Ming dynasty
Shih-Shan Henry Tsai writes that the Yongle Emperor sent his eunuch Yang Sanbao into Tibet in 1413 to gain the allegiance of various Tibetan princes, while the Yongle Emperor paid a small fortune in return gifts for tributes in order to maintain the loyalty of neighboring vassal states such as Nepal and Tibet. However, Van Praag states that Tibetan rulers upheld their own separate relations with the kingdoms of Nepal and Kashmir, and at times "engaged in armed confrontation with them."

Where did the Yongle Emperor send Yang Sanbao?
Output: Tibet


Problem: Please answer a question about the following article about Uranium:
The discovery of the element is credited to the German chemist Martin Heinrich Klaproth. While he was working in his experimental laboratory in Berlin in 1789, Klaproth was able to precipitate a yellow compound (likely sodium diuranate) by dissolving pitchblende in nitric acid and neutralizing the solution with sodium hydroxide. Klaproth assumed the yellow substance was the oxide of a yet-undiscovered element and heated it with charcoal to obtain a black powder, which he thought was the newly discovered metal itself (in fact, that powder was an oxide of uranium). He named the newly discovered element after the planet Uranus, (named after the primordial Greek god of the sky), which had been discovered eight years earlier by William Herschel.
Who discovered the planet Uranus?
A:
William Herschel