Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Islamic tradition relates that Muhammad received his first revelation in the Cave of Hira during one of his isolated retreats to the mountains. Thereafter, he received revelations over a period of 23 years. According to hadith and Muslim history, after Muhammad immigrated to Medina and formed an independent Muslim community, he ordered many of his companions to recite the Quran and to learn and teach the laws, which were revealed daily. It is related that some of the Quraysh who were taken prisoners at the battle of Badr regained their freedom after they had taught some of the Muslims the simple writing of the time. Thus a group of Muslims gradually became literate. As it was initially spoken, the Quran was recorded on tablets, bones, and the wide, flat ends of date palm fronds. Most suras were in use amongst early Muslims since they are mentioned in numerous sayings by both Sunni and Shia sources, relating Muhammad's use of the Quran as a call to Islam, the making of prayer and the manner of recitation. However, the Quran did not exist in book form at the time of Muhammad's death in 632. There is agreement among scholars that Muhammad himself did not write down the revelation.
Vegetation from which tree served as an later recording medium for the Quran?
A: unanswerable

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In the 1970s, computer engineers at research institutions throughout the United States began to link their computers together using telecommunications technology. The effort was funded by ARPA (now DARPA), and the computer network that resulted was called the ARPANET. The technologies that made the Arpanet possible spread and evolved.
ARPA is now known as what?
A: DARPA)

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Within the diasporan Armenian community, there is an unofficial classification of the different kinds of Armenians. For example, Armenians who originate from Iran are referred to as Parskahay (Պարսկահայ), while Armenians from Lebanon are usually referred to as Lipananahay (Լիբանանահայ). Armenians of the Diaspora are the primary speakers of the Western dialect of the Armenian language. This dialect has considerable differences with Eastern Armenian, but speakers of either of the two variations can usually understand each other. Eastern Armenian in the diaspora is primarily spoken in Iran and European countries such as Ukraine, Russia, and Georgia (where they form a majority in the Samtskhe-Javakheti province). In diverse communities (such as in Canada and the U.S.) where many different kinds of Armenians live together, there is a tendency for the different groups to cluster together.
What can speakers of the variations of Parskahay do?
A: unanswerable

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Greece is a developed country with high standards of living[citation needed] and high Human Development Index. Its economy mainly comprises the service sector (85.0%) and industry (12.0%), while agriculture makes up 3.0% of the national economic output. Important Greek industries include tourism (with 14.9 million international tourists in 2009, it is ranked as the 7th most visited country in the European Union and 16th in the world by the United Nations World Tourism Organization) and merchant shipping (at 16.2% of the world's total capacity, the Greek merchant marine is the largest in the world), while the country is also a considerable agricultural producer (including fisheries) within the union.
Greece holds what rank among most visited countries in the world?
A:
16th