Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
During the later Roman Empire, the principal military developments were attempts to create an effective cavalry force as well as the continued development of highly specialised types of troops. The creation of heavily armoured cataphract-type soldiers as cavalry was an important feature of the 5th-century Roman military. The various invading tribes had differing emphasis on types of soldiersranging from the primarily infantry Anglo-Saxon invaders of Britain to the Vandals and Visigoths, who had a high proportion of cavalry in their armies. During the early invasion period, the stirrup had not been introduced into warfare, which limited the usefulness of cavalry as shock troops because it was not possible to put the full force of the horse and rider behind blows struck by the rider. The greatest change in military affairs during the invasion period was the adoption of the Hunnic composite bow in place of the earlier, and weaker, Scythian composite bow. Another development was the increasing use of longswords and the progressive replacement of scale armour by mail armour and lamellar armour.
What Scythian weapon was used during this era?
A: composite bow

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
San Diego's roadway system provides an extensive network of routes for travel by bicycle. The dry and mild climate of San Diego makes cycling a convenient and pleasant year-round option. At the same time, the city's hilly, canyon-like terrain and significantly long average trip distancesbrought about by strict low-density zoning lawssomewhat restrict cycling for utilitarian purposes. Older and denser neighborhoods around the downtown tend to be utility cycling oriented. This is partly because of the grid street patterns now absent in newer developments farther from the urban core, where suburban style arterial roads are much more common. As a result, a vast majority of cycling-related activities are recreational. Testament to San Diego's cycling efforts, in 2006, San Diego was rated as the best city for cycling for U.S. cities with a population over 1 million.
What makes San Diego the ideal city to commute via bike?
A: dry and mild climate

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The origins of al-Qaeda can be traced to the Soviet war in Afghanistan (December 1979 February 1989). The United States, United Kingdom, Saudi Arabia, Pakistan, and the People's Republic of China supported the Islamist Afghan mujahadeen guerillas against the military forces of the Soviet Union and the Democratic Republic of Afghanistan. A small number of "Afghan Arab" volunteers joined the fight against the Soviets, including Osama bin Laden, but there is no evidence they received any external assistance. In May 1996 the group World Islamic Front for Jihad Against Jews and Crusaders (WIFJAJC), sponsored by bin Laden (and later re-formed as al-Qaeda), started forming a large base of operations in Afghanistan, where the Islamist extremist regime of the Taliban had seized power earlier in the year. In February 1998, Osama bin Laden signed a fatwa, as head of al-Qaeda, declaring war on the West and Israel, later in May of that same year al-Qaeda released a video declaring war on the U.S. and the West.
What document declared war on the Soviet Union?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Everton regularly take large numbers away from home both domestically and in European fixtures. The club implements a loyalty points scheme offering the first opportunity to purchase away tickets to season ticket holders who have attended the most away matches. Everton often sell out the full allocation in away grounds and tickets sell particularly well for North West England away matches. In October 2009, Everton took 7,000 travelling fans to Benfica, their largest ever away crowd in Europe since the 1985 European Cup Winners' Cup Final.
How many travelling fans did Everton bring with them to Benefica in 2009?
A:
7,000