Problem: Alexander Graham Bell:

The March 1906 Scientific American article by American pioneer William E. Meacham explained the basic principle of hydrofoils and hydroplanes. Bell considered the invention of the hydroplane as a very significant achievement. Based on information gained from that article he began to sketch concepts of what is now called a hydrofoil boat. Bell and assistant Frederick W. "Casey" Baldwin began hydrofoil experimentation in the summer of 1908 as a possible aid to airplane takeoff from water. Baldwin studied the work of the Italian inventor Enrico Forlanini and began testing models. This led him and Bell to the development of practical hydrofoil watercraft.

Who helped Bell investigate hydrofoils in 1908?
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A: Frederick W. "Casey" Baldwin


Problem: Depopulation, deurbanisation, invasion, and movement of peoples, which had begun in Late Antiquity, continued in the Early Middle Ages. The barbarian invaders, including various Germanic peoples, formed new kingdoms in what remained of the Western Roman Empire. In the 7th century, North Africa and the Middle East—once part of the Eastern Roman Empire—came under the rule of the Caliphate, an Islamic empire, after conquest by Muhammad's successors. Although there were substantial changes in society and political structures, the break with Antiquity was not complete. The still-sizeable Byzantine Empire survived in the east and remained a major power. The empire's law code, the Code of Justinian, was rediscovered in Northern Italy in 1070 and became widely admired later in the Middle Ages. In the West, most kingdoms incorporated the few extant Roman institutions. Monasteries were founded as campaigns to Christianise pagan Europe continued. The Franks, under the Carolingian dynasty, briefly established the Carolingian Empire during the later 8th and early 9th century. It covered much of Western Europe, but later succumbed to the pressures of internal civil wars combined with external invasions—Vikings from the north, Magyars from the east, and Saracens from the south.
Along with the movement of peoples, invasion and depopulation, what event started in Late Antiquity and continued into the Middle Ages?
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Answer: deurbanisation


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Groups are also applied in many other mathematical areas. Mathematical objects are often examined by associating groups to them and studying the properties of the corresponding groups. For example, Henri Poincaré founded what is now called algebraic topology by introducing the fundamental group. By means of this connection, topological properties such as proximity and continuity translate into properties of groups.i[›] For example, elements of the fundamental group are represented by loops. The second image at the right shows some loops in a plane minus a point. The blue loop is considered null-homotopic (and thus irrelevant), because it can be continuously shrunk to a point. The presence of the hole prevents the orange loop from being shrunk to a point. The fundamental group of the plane with a point deleted turns out to be infinite cyclic, generated by the orange loop (or any other loop winding once around the hole). This way, the fundamental group detects the hole.
What causes the orange loop to shrink to a point?
A: unanswerable


Context and question: The Bronx is the home of the New York Yankees of Major League Baseball. The original Yankee Stadium opened in 1923 on 161st Street and River Avenue, a year that saw the Yankees bring home their first of 27 World Series Championships. With the famous facade, the short right field porch and Monument Park, Yankee Stadium has been home to many of baseball's greatest players including Babe Ruth, Lou Gehrig, Joe DiMaggio, Whitey Ford, Yogi Berra, Mickey Mantle, Reggie Jackson, Derek Jeter and Mariano Rivera.
Where was the first Yankee Stadium?
Answer: on 161st Street and River Avenue


Question: In 2005, the UN Security Council adopted Resolution 1624 concerning incitement to commit acts of terrorism and the obligations of countries to comply with international human rights laws. Although both resolutions require mandatory annual reports on counter-terrorism activities by adopting nations, the United States and Israel have both declined to submit reports. In the same year, the United States Department of Defense and the Chairman of the Joint Chiefs of Staff issued a planning document, by the name "National Military Strategic Plan for the War on Terrorism", which stated that it constituted the "comprehensive military plan to prosecute the Global War on Terror for the Armed Forces of the United States...including the findings and recommendations of the 9/11 Commission and a rigorous examination with the Department of Defense".
Is there an answer to this question: What document did the Israeli Department of Defense publish?

Answer: unanswerable


However, Samoans greatly resented New Zealand's colonial rule, and blamed inflation and the catastrophic 1918 flu epidemic on its misrule. By the late 1920s the resistance movement against colonial rule had gathered widespread support. One of the Mau leaders was Olaf Frederick Nelson, a half Samoan and half Swedish merchant. Nelson was eventually exiled during the late 1920s and early 1930s, but he continued to assist the organisation financially and politically. In accordance with the Mau's non-violent philosophy, the newly elected leader, High Chief Tupua Tamasese Lealofi, led his fellow uniformed Mau in a peaceful demonstration in downtown Apia on 28 December 1929.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What title was given to the Mau's elected leader, Tupua Tamasese Lealofi?
Ah, so..
High Chief