Problem: Planck constant:

In principle, the Planck constant could be determined by examining the spectrum of a black-body radiator or the kinetic energy of photoelectrons, and this is how its value was first calculated in the early twentieth century. In practice, these are no longer the most accurate methods. The CODATA value quoted here is based on three watt-balance measurements of KJ2RK and one inter-laboratory determination of the molar volume of silicon, but is mostly determined by a 2007 watt-balance measurement made at the U.S. National Institute of Standards and Technology (NIST). Five other measurements by three different methods were initially considered, but not included in the final refinement as they were too imprecise to affect the result.

One other measure involved the molar volume of what element?
---
A: silicon


Problem: Opera debuted in 1996; it has never achieved widespread use, having less than 2% browser usage share as of February 2012 according to Net Applications. Its Opera-mini version has an additive share, in April 2011 amounting to 1.1% of overall browser use, but focused on the fast-growing mobile phone web browser market, being preinstalled on over 40 million phones. It is also available on several other embedded systems, including Nintendo's Wii video game console.
What accounted for 1.1% of browser use in April 2011?
---
Answer: Opera-mini version


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Treatment of TB uses antibiotics to kill the bacteria. Effective TB treatment is difficult, due to the unusual structure and chemical composition of the mycobacterial cell wall, which hinders the entry of drugs and makes many antibiotics ineffective. The two antibiotics most commonly used are isoniazid and rifampicin, and treatments can be prolonged, taking several months. Latent TB treatment usually employs a single antibiotic, while active TB disease is best treated with combinations of several antibiotics to reduce the risk of the bacteria developing antibiotic resistance. People with latent infections are also treated to prevent them from progressing to active TB disease later in life. Directly observed therapy, i.e., having a health care provider watch the person take their medications, is recommended by the WHO in an effort to reduce the number of people not appropriately taking antibiotics. The evidence to support this practice over people simply taking their medications independently is poor. Methods to remind people of the importance of treatment do, however, appear effective.
How long are antibiotics ineffective?
A: unanswerable


Context and question: Various models of climate change have been projected into the 22nd century for the Alps, with an expectation that a trend toward increased temperatures will have an effect on snowfall, snowpack, glaciation, and river runoff.
What have the various models been of?
Answer: climate change


Question: That year, Queen began The Works Tour, the first tour to feature keyboardist Spike Edney as an extra live musician. The tour featured nine sold-out dates in October in Bophuthatswana, South Africa, at the arena in Sun City. Upon returning to England, they were the subject of outrage, having played in South Africa during the height of apartheid and in violation of worldwide divestment efforts and a United Nations cultural boycott. The band responded to the critics by stating that they were playing music for fans in South Africa, and they also stressed that the concerts were played before integrated audiences. Queen donated to a school for the deaf and blind as a philanthropic gesture but were fined by the British Musicians' Union and placed on the United Nations' blacklisted artists.
Is there an answer to this question: Queen's Spike Edney plays what instrument?

Answer: keyboardist


Problem: Jews:

Notable exceptions include the massacre of Jews and forcible conversion of some Jews by the rulers of the Almohad dynasty in Al-Andalus in the 12th century, as well as in Islamic Persia, and the forced confinement of Moroccan Jews to walled quarters known as mellahs beginning from the 15th century and especially in the early 19th century. In modern times, it has become commonplace for standard antisemitic themes to be conflated with anti-Zionist publications and pronouncements of Islamic movements such as Hezbollah and Hamas, in the pronouncements of various agencies of the Islamic Republic of Iran, and even in the newspapers and other publications of Turkish Refah Partisi."

What were walled quarters known as?
---
A:
mellahs