With the extension of Turkish dominion into the Balkans, the strategic conquest of Constantinople became a crucial objective. The empire had managed to control nearly all former Byzantine lands surrounding the city, but in 1402 the Byzantines were temporarily relieved when the Turco-Mongol leader Timur, founder of the Timurid Empire, invaded Anatolia from the east. In the Battle of Ankara in 1402, Timur defeated the Ottoman forces and took Sultan Bayezid I as a prisoner, throwing the empire into disorder. The ensuing civil war lasted from 1402 to 1413 as Bayezid's sons fought over succession. It ended when Mehmed I emerged as the sultan and restored Ottoman power, bringing an end to the Interregnum, also known as the Fetret Devri.
What leader invaded Anatolia from the east?
Timur


Input: Beyoncé
In October 2014, Beyoncé signed a deal to launch an activewear line of clothing with British fashion retailer Topshop. The 50-50 venture is called Parkwood Topshop Athletic Ltd and is scheduled to launch its first dance, fitness and sports ranges in autumn 2015. The line will launch in April 2016.

When will the full line appear?
Output: April 2016


Input: Article: An FBI special agent is issued a Glock Model 22 pistol or a Glock 23 in .40 S&W caliber. If they fail their first qualification, they are issued either a Glock 17 or Glock 19, to aid in their next qualification. In May 1997, the FBI officially adopted the Glock .40 S&W pistol for general agent use and first issued it to New Agent Class 98-1 in October 1997. At present, the Model 23 "FG&R" (finger groove and rail) is the issue sidearm. New agents are issued firearms, on which they must qualify, on successful completion of their training at the FBI Academy. The Glock 26 in 9×19mm Parabellum, and Glock Models 23 and 27 in .40 S&W caliber are authorized as secondary weapons. Special agents are authorized to purchase and qualify with the Glock Model 21 in .45 ACP. Special agents of the FBI HRT (Hostage Rescue Team), and regional SWAT teams are issued the Springfield Professional Model 1911A1 .45 ACP pistol (see FBI Special Weapons and Tactics Teams).

Now answer this question: What are FBI special agents issued if they fail their first qualification?

Output: Glock 17 or Glock 19


Article: On runways, green lights indicate the beginning of the runway for landing, while red lights indicate the end of the runway. Runway edge lighting consists of white lights spaced out on both sides of the runway, indicating the edge. Some airports have more complicated lighting on the runways including lights that run down the centerline of the runway and lights that help indicate the approach (an approach lighting system, or ALS). Low-traffic airports may use pilot controlled lighting to save electricity and staffing costs.

Question: What may low-traffic airports use to save electricity and staffing costs?
Ans: pilot controlled lighting


Here is a question about this article: The Cenozoic Era covers the 66 million years since the Cretaceous–Paleogene extinction event up to and including the present day. By the end of the Mesozoic era, the continents had rifted into nearly their present form. Laurasia became North America and Eurasia, while Gondwana split into South America, Africa, Australia, Antarctica and the Indian subcontinent, which collided with the Asian plate. This impact gave rise to the Himalayas. The Tethys Sea, which had separated the northern continents from Africa and India, began to close up, forming the Mediterranean sea.
What is the answer to this question: At the end of which era had the continents taken roughly their current shape?
****
So... Mesozoic


Article: Ethnic Russians constitute 25.5% of the country's current population and 58.6% of the native Estonian population is also able to speak Russian. In all, 67.8% of Estonia's population can speak Russian. Command of Russian language, however, is rapidly decreasing among younger Estonians (primarily being replaced by the command of English). For example, if 53% of ethnic Estonians between 15 and 19 claim to speak some Russian, then among the 10- to 14-year-old group, command of Russian has fallen to 19% (which is about one-third the percentage of those who claim to have command of English in the same age group).

Question: What is the ratio of young Estonians who speak Russian relative to those who speak English?
Ans:
about one-third