The problem: Answer a question about this article:
The U.S., UK, France, Italy and the majority of other Western countries considered the annexation of Estonia by the USSR illegal. They retained diplomatic relations with the representatives of the independent Republic of Estonia, never de jure recognised the existence of the Estonian SSR, and never recognised Estonia as a legal constituent part of the Soviet Union. Estonia's return to independence became possible as the Soviet Union faced internal regime challenges, loosening its hold on the outer empire. As the 1980s progressed, a movement for Estonian autonomy started. In the initial period of 19871989, this was partially for more economic independence, but as the Soviet Union weakened and it became increasingly obvious that nothing short of full independence would do, Estonia began a course towards self-determination.
What relationship did Western countries continue with Estonia?
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The answer: diplomatic relations

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The Tucson metro area is served by many local television stations and is the 68th largest designated market area (DMA) in the U.S. with 433,310 homes (0.39% of the total U.S.). It is limited to the three counties of southeastern Arizona (Pima, Santa Cruz, and Cochise) The major television networks serving Tucson are: KVOA 4 (NBC), KGUN 9 (ABC), KMSB-TV 11 (Fox), KOLD-TV 13 (CBS), KTTU 18 (My Network TV) and KWBA 58 (The CW). KUAT-TV 6 is a PBS affiliate run by the University of Arizona (as is sister station KUAS 27).
What is Tucson's NBC station?
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The answer: KVOA 4

The problem: Answer a question about this article:
A elevator of this kind uses a vacuum on top of the cab and a valve on the top of the "shaft" to move the cab upwards and closes the valve in order to keep the cab at the same level. a diaphragm or a piston is used as a "brake" if there's a sudden increase in pressure avove the cab. however, to go down, it opens the valve so that the air can pressurize the top of the "shaft", allowing the cab to go down by its own weight. this also means that in case of a power failure, the cab will automatically go down. the "shaft" is made of acrilic, is always round, due to the shape of the vacuum pump turbine. in order to keep the air inside of the cab, rubber seals are used. due to technical limitations, these elevators have a low capacity. they usually allow 1-3 passengers and up to 525 lbs.
For sudden surges in pressure above the cab, what is used as a "brake"?
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The answer: a diaphragm or a piston

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This influx was compounded by the decline of the Western Sudanic Mali Empire in 1375 and the Songhai Empire in 1591. Additionally, as inland regions underwent desertification, inhabitants moved to the wetter coast. These new inhabitants brought skills such as cotton spinning, cloth weaving, iron smelting, rice and sorghum cultivation, and social and political institutions from the Mali and Songhai empires. Shortly after the Mane conquered the region, the Vai people of the former Mali Empire immigrated into the Grand Cape Mount region. The ethnic Kru opposed the influx of Vai, forming an alliance with the Mane to stop further influx of Vai.[citation needed]
What happened when regions underwent desertification?
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The answer:
inhabitants moved to the wetter coast