Problem: Vacuum:

In the medieval Middle Eastern world, the physicist and Islamic scholar, Al-Farabi (Alpharabius, 872–950), conducted a small experiment concerning the existence of vacuum, in which he investigated handheld plungers in water.[unreliable source?] He concluded that air's volume can expand to fill available space, and he suggested that the concept of perfect vacuum was incoherent. However, according to Nader El-Bizri, the physicist Ibn al-Haytham (Alhazen, 965–1039) and the Mu'tazili theologians disagreed with Aristotle and Al-Farabi, and they supported the existence of a void. Using geometry, Ibn al-Haytham mathematically demonstrated that place (al-makan) is the imagined three-dimensional void between the inner surfaces of a containing body. According to Ahmad Dallal, Abū Rayhān al-Bīrūnī also states that "there is no observable evidence that rules out the possibility of vacuum". The suction pump later appeared in Europe from the 15th century.

who stated that there was no evidence to rule out a vacuum?
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A: Abū Rayhān al-Bīrūnī


Problem: In the 1980s, lush jazz-R&B fusion (George Benson, Patti Austin, Al Jarreau) and stylish crossover R&B (Anita Baker and Luther Vandross, New Edition and Keith Sweat) were equally successful within the mainstream. In the 1990s and early 2000s (decade), artists as sonically contrasting as R. Kelly, Leona Lewis (mainly ballads) and Jill Scott both fit the bill, provided the audience for the material was mature. By riding and contributing to nearly all of the trends, no one has exemplified the style more than Babyface, whose career thrived over 20 years as a member of the Deele (Two Occasions), a solo artist (Whip Appeal, When Can I See You), and a songwriter/producer (Toni Braxton's Breathe Again, Boyz II Men's I'll Make Love to You).
Who wrote Boyz II Men's I'll Make Love to You?
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Answer: Babyface


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The Third Great Awakening refers to a hypothetical historical period that was marked by religious activism in American history and spans the late 1850s to the early 20th century. It affected pietistic Protestant denominations and had a strong element of social activism. It gathered strength from the postmillennial belief that the Second Coming of Christ would occur after mankind had reformed the entire earth. It was affiliated with the Social Gospel Movement, which applied Christianity to social issues and gained its force from the Awakening, as did the worldwide missionary movement. New groupings emerged, such as the Holiness, Nazarene, and Christian Science movements.
What new groups were formed as a result of the Third Great Awakening?
A: the Holiness, Nazarene, and Christian Science movements


Context and question: In September 2005, West announced that he would release his Pastelle Clothing line in spring 2006, claiming "Now that I have a Grammy under my belt and Late Registration is finished, I am ready to launch my clothing line next spring." The line was developed over the following four years – with multiple pieces teased by West himself – before the line was ultimately cancelled in 2009. In 2009, West collaborated with Nike to release his own shoe, the Air Yeezys, with a second version released in 2012. In January 2009, West introduced his first shoe line designed for Louis Vuitton during Paris Fashion Week. The line was released in summer 2009. West has additionally designed shoewear for Bape and Italian shoemaker Giuseppe Zanotti.
What finally become of Kanye's clothing line in 2009?
Answer: cancelled


Question: The National Archives Building in downtown Washington holds record collections such as all existing federal census records, ships' passenger lists, military unit records from the American Revolution to the Philippine–American War, records of the Confederate government, the Freedmen's Bureau records, and pension and land records.
Is there an answer to this question: What is the earliest war the Freedmen's Bureau has records for?

Answer: unanswerable


Artifacts from the Paleolithic suggest that the moon was used to reckon time as early as 6,000 years ago. Lunar calendars were among the first to appear, either 12 or 13 lunar months (either 354 or 384 days). Without intercalation to add days or months to some years, seasons quickly drift in a calendar based solely on twelve lunar months. Lunisolar calendars have a thirteenth month added to some years to make up for the difference between a full year (now known to be about 365.24 days) and a year of just twelve lunar months. The numbers twelve and thirteen came to feature prominently in many cultures, at least partly due to this relationship of months to years. Other early forms of calendars originated in Mesoamerica, particularly in ancient Mayan civilization. These calendars were religiously and astronomically based, with 18 months in a year and 20 days in a month.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How many days did it take to date artifacts from the Paleolithic?
Ah, so..
unanswerable