Input: Read this: New York's high rate of public transit use, over 200,000 daily cyclists as of 2014, and many pedestrian commuters make it the most energy-efficient major city in the United States. Walk and bicycle modes of travel account for 21% of all modes for trips in the city; nationally the rate for metro regions is about 8%. In both its 2011 and 2015 rankings, Walk Score named New York City the most walkable large city in the United States. Citibank sponsored the introduction of 10,000 public bicycles for the city's bike-share project in the summer of 2013. Research conducted by Quinnipiac University showed that a majority of New Yorkers support the initiative. New York City's numerical "in-season cycling indicator" of bicycling in the city hit an all-time high in 2013.
Question: Research by what institution of higher learning showed that most New Yorkers support bicycle sharing?

Output: Quinnipiac University

QUES: Apple was initially reluctant to embrace mice with multiple buttons and scroll wheels. Macs did not natively support pointing devices that featured multiple buttons, even from third parties, until Mac OS X arrived in 2001. Apple continued to offer only single button mice, in both wired and Bluetooth wireless versions, until August 2005, when it introduced the Mighty Mouse. While it looked like a traditional one-button mouse, it actually had four buttons and a scroll ball, capable of independent x- and y-axis movement. A Bluetooth version followed in July 2006. In October 2009, Apple introduced the Magic Mouse, which uses multi-touch gesture recognition (similar to that of the iPhone) instead of a physical scroll wheel or ball. It is available only in a wireless configuration, but the wired Mighty Mouse (re-branded as "Apple Mouse") is still available as an alternative. Since 2010, Apple has also offered the Magic Trackpad as a means to control Macintosh desktop computers in a way similar to laptops.

What did Apple introduce to take the place of a physical scroll wheel in 2009?
What is the answer?
ANS: multi-touch gesture recognition

QUES: Following the start of the Arab Spring in 2011, Gaddafi spoke out in favour of Tunisian President Zine El Abidine Ben Ali, then threatened by the Tunisian Revolution. He suggested that Tunisia's people would be satisfied if Ben Ali introduced a Jamahiriyah system there. Fearing domestic protest, Libya's government implemented preventative measures, reducing food prices, purging the army leadership of potential defectors and releasing several Islamist prisoners. They proved ineffective, and on 17 February 2011, major protests broke out against Gaddafi's government. Unlike Tunisia or Egypt, Libya was largely religiously homogenous and had no strong Islamist movement, but there was widespread dissatisfaction with the corruption and entrenched systems of patronage, while unemployment had reached around 30%.
On what date in 2011 did protests begin in Libya?

ANS: 17 February

In 1943, Karachay Autonomous Oblast was dissolved by Joseph Stalin, when the Karachays were exiled to Central Asia for their alleged collaboration with the Germans and territory was incorporated into the Georgian SSR.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When was the Karachay Autonomous Oblast not ended?
Ah, so.. unanswerable

Question: The Bibliotheque nationale et universitaire (BNU) is, with its collection of more than 3,000,000 titles, the second largest library in France after the Bibliotheque nationale de France. It was founded by the German administration after the complete destruction of the previous municipal library in 1871 and holds the unique status of being simultaneously a students' and a national library. The Strasbourg municipal library had been marked erroneously as "City Hall" in a French commercial map, which had been captured and used by the German artillery to lay their guns. A librarian from Munich later pointed out "...that the destruction of the precious collection was not the fault of a German artillery officer, who used the French map, but of the slovenly and inaccurate scholarship of a Frenchman."
Try to answer this question if possible: How many books does the Bibliotheque nationale de France hold?
Answer: unanswerable

Input: Read this: Dell was listed at number 51 in the Fortune 500 list, until 2014. After going private in 2013, the newly confidential nature of its financial information prevents the company from being ranked by Fortune. In 2014 it was the third largest PC vendor in the world after Lenovo and HP. Dell is currently the #1 shipper of PC monitors in the world. Dell is the sixth largest company in Texas by total revenue, according to Fortune magazine. It is the second largest non-oil company in Texas behind AT&T and the largest company in the Greater Austin area. It was a publicly traded company (NASDAQ: DELL), as well as a component of the NASDAQ-100 and S&P 500, until it was taken private in a leveraged buyout which closed on October 30, 2013.
Question: What number was dell on the Fortune 500 list until 2014?

Output:
51