Article: Historically, the name Armenian has come to internationally designate this group of people. It was first used by neighbouring countries of ancient Armenia. The earliest attestations of the exonym Armenia date around the 6th century BC. In his trilingual Behistun Inscription dated to 517 BC, Darius I the Great of Persia refers to Urashtu (in Babylonian) as Armina (in Old Persian; Armina ( ) and Harminuya (in Elamite). In Greek, "Armenians" is attested from about the same time, perhaps the earliest reference being a fragment attributed to Hecataeus of Miletus (476 BC). Xenophon, a Greek general serving in some of the Persian expeditions, describes many aspects of Armenian village life and hospitality in around 401 BC. He relates that the people spoke a language that to his ear sounded like the language of the Persians.

Question: Who described Armenian life in 401 BC?
Ans: Xenophon

Article: Penny Marshall's 1990 film Awakenings, which was nominated for several Oscars, is based on neurologist Oliver Sacks' 1973 account of his psychiatric patients at Beth Abraham Hospital in the Bronx who were paralyzed by a form of encephalitis but briefly responded to the drug L-dopa. Robin Williams played the physician; Robert De Niro was one of the patients who emerged from a catatonic (frozen) state. The home of Williams' character was shot not far from Sacks' actual City Island residence. A 1973 Yorkshire Television documentary and "A Kind of Alaska", a 1985 play by Harold Pinter, were also based on Sacks' book.

Question: Whose real story is 'Awakenings' based on?
Ans: Oliver Sacks

Article: The quality of a vacuum is indicated by the amount of matter remaining in the system, so that a high quality vacuum is one with very little matter left in it. Vacuum is primarily measured by its absolute pressure, but a complete characterization requires further parameters, such as temperature and chemical composition. One of the most important parameters is the mean free path (MFP) of residual gases, which indicates the average distance that molecules will travel between collisions with each other. As the gas density decreases, the MFP increases, and when the MFP is longer than the chamber, pump, spacecraft, or other objects present, the continuum assumptions of fluid mechanics do not apply. This vacuum state is called high vacuum, and the study of fluid flows in this regime is called particle gas dynamics. The MFP of air at atmospheric pressure is very short, 70 nm, but at 100 mPa (~6997100000000000000♠️1103 Torr) the MFP of room temperature air is roughly 100 mm, which is on the order of everyday objects such as vacuum tubes. The Crookes radiometer turns when the MFP is larger than the size of the vanes.

Question: What does the MFP of residual gases show?
Ans: average distance that molecules will travel between collisions with each other.

Article: Its knowledge and uses spread from China through the Middle East to medieval Europe in the 13th century, where the first water powered paper mills were built. Because of paper's introduction to the West through the city of Baghdad, it was first called bagdatikos. In the 19th century, industrial manufacture greatly lowered its cost, enabling mass exchange of information and contributing to significant cultural shifts. In 1844, the Canadian inventor Charles Fenerty and the German F. G. Keller independently developed processes for pulping wood fibres.

Question: In which century did the process become much cheaper than before?
Ans:
19th