Problem: Nanjing:

In the past 20 years, several commercial streets have been developed, hence the nightlife has become more diverse: there are shopping malls opening late in the Xinjiekou CBD and Hunan Road. The well-established "Nanjing 1912" district hosts a wide variety of recreational facilities ranging from traditional restaurants and western pubs to dance clubs. There are two major areas where bars are densely located; one is in 1912 block; the other is along Shanghai road and its neighbourhood. Both are popular with international residents of the city.

When did more commercial streets become built in Nanjing?
---
A: In the past 20 years

Problem: Molotov%E2%80%93Ribbentrop Pact:

The treaty was published in the United States for the first time by the St. Louis Post-Dispatch on May 22, 1946, in Britain by the Manchester Guardian. It was also part of an official State Department publication, NaziSoviet Relations 19391941, edited by Raymond J. Sontag and James S. Beddie in January 1948. The decision to publish the key documents on GermanSoviet relations, including the treaty and protocol, had been taken already in spring 1947. Sontag and Beddie prepared the collection throughout the summer of 1947. In November 1947, President Truman personally approved the publication but it was held back in view of the Foreign Ministers Conference in London scheduled for December. Since negotiations at that conference did not prove constructive from an American point of view, the document edition was sent to press. The documents made headlines worldwide. State Department officials counted it as a success: "The Soviet Government was caught flat-footed in what was the first effective blow from our side in a clear-cut propaganda war."

Where was the Foreign Ministers conference held?
---
A: London

Problem: Lancashire:

Lancashire has a mostly comprehensive system with four state grammar schools. Not including sixth form colleges, there are 77 state schools (not including Burnley's new schools) and 24 independent schools. The Clitheroe area has secondary modern schools. Sixth form provision is limited at most schools in most districts, with only Fylde and Lancaster districts having mostly sixth forms at schools. The rest depend on FE colleges and sixth form colleges, where they exist. South Ribble has the largest school population and Fylde the smallest (only three schools). Burnley's schools have had a new broom and have essentially been knocked down and started again in 2006. There are many Church of England and Catholic faith schools in Lancashire.

Who has the smallest school population?
---
A: Fylde

Problem: Gramophone record:

The normal commercial disc is engraved with two sound-bearing concentric spiral grooves, one on each side, running from the outside edge towards the center. The last part of the spiral meets an earlier part to form a circle. The sound is encoded by fine variations in the edges of the groove that cause a stylus (needle) placed in it to vibrate at acoustic frequencies when the disc is rotated at the correct speed. Generally, the outer and inner parts of the groove bear no intended sound (an exception is Split Enz's Mental Notes).

Do all grooves bear data?
---
A:
no