Problem: Alexander Graham Bell:

Bell's own detailed account, presented to the American Association for the Advancement of Science in 1882, differs in several particulars from most of the many and varied versions now in circulation, most notably by concluding that extraneous metal was not to blame for failure to locate the bullet. Perplexed by the peculiar results he had obtained during an examination of Garfield, Bell "...proceeded to the Executive Mansion the next morning...to ascertain from the surgeons whether they were perfectly sure that all metal had been removed from the neighborhood of the bed. It was then recollected that underneath the horse-hair mattress on which the President lay was another mattress composed of steel wires. Upon obtaining a duplicate, the mattress was found to consist of a sort of net of woven steel wires, with large meshes. The extent of the [area that produced a response from the detector] having been so small, as compared with the area of the bed, it seemed reasonable to conclude that the steel mattress had produced no detrimental effect." In a footnote, Bell adds that "The death of President Garfield and the subsequent post-mortem examination, however, proved that the bullet was at too great a distance from the surface to have affected our apparatus."

Where did Bell go the day after trying to find the bullet?
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A: Executive Mansion

Problem: Plymouth also has 71 state primary phase schools, 13 state secondary schools, eight special schools and three selective state grammar schools, Devonport High School for Girls, Devonport High School for Boys and Plymouth High School for Girls. There is also an independent school Plymouth College.
How many state grammar schools are based in Plymouth?
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Answer: three

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In the Middle Ages, several powerful Somali empires dominated the regional trade including the Ajuran Sultanate, which excelled in hydraulic engineering and fortress building, the Sultanate of Adal, whose general Ahmad ibn Ibrahim al-Ghazi (Ahmed Gurey) was the first commander to use cannon warfare on the continent during Adal's conquest of the Ethiopian Empire, and the Sultanate of the Geledi, whose military dominance forced governors of the Omani empire north of the city of Lamu to pay tribute to the Somali Sultan Ahmed Yusuf.
What state did Adal conquer?
A: the Ethiopian Empire

Context and question: Maintaining continuity with his predecessors, John XXIII continued the gradual reform of the Roman liturgy, and published changes that resulted in the 1962 Roman Missal, the last typical edition containing the Tridentine Mass established in 1570 by Pope Pius V at the request of the Council of Trent and whose continued use Pope Benedict XVI authorized in 2007, under the conditions indicated in his motu proprio Summorum Pontificum. In response to the directives of the Second Vatican Council, later editions of the Roman Missal present the 1970 form of the Roman Rite.
What did Pope Pius V continue to authorize the use of in 2007?
Answer: unanswerable

Question: The Central African Republic (CAR; Sango: Kodorosese ti Beafrika; French: Republique centrafricaine pronounced: [epyblik stafikn], or Centrafrique [stafik]) is a landlocked country in Central Africa. It is bordered by Chad to the north, Sudan to the northeast, South Sudan to the east, the Democratic Republic of the Congo and the Republic of the Congo to the south and Cameroon to the west. The CAR covers a land area of about 620,000 square kilometres (240,000 sq mi) and had an estimated population of around 4.7 million as of 2014[update].
Is there an answer to this question: What country borders CAR in the North?

Answer: Chad

The word slovo ("word") and the related slava ("fame") and slukh ("hearing") originate from the Proto-Indo-European root *klew- ("be spoken of, fame"), cognate with Ancient Greek (kles - "famous"), whence the name Pericles, and Latin clueo ("be called"), and English loud.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What Slavic word means "loud"?
Ah, so..
unanswerable