The problem: Answer a question about this article:
La Cueva De Las Ventanas (The Cave of Windows), a series of cliff dwellings along an important trade route, and Las Jarillas Cave scrambled along the canyons of the Sierra Madre in Northwestern Chihuahua date between AD 1205 and 1260 and belong to the Paquime culture. Cuarenta Casas is thought to have been a branch settlement from Paquime to protect the trade route from attack. Archaeologists believe the civilization began to decline during the 13th century and by the 15th century the inhabitants of Paquime sought refuge in the Sierra Madre Occidental while others are thought to have emigrated north and joined the Ancestral Pueblo peoples. According to anthropologist current natives tribes (Yaqui, Mayo, Opata, and Tarahumara) are descendants of the Casas Grandes culture.
Along which mountain range does the Cave of Windows lie?
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The answer: Sierra Madre

The problem: Answer a question about this article:
In May 2005, the first high definition video conferencing systems, produced by LifeSize Communications, were displayed at the Interop trade show in Las Vegas, Nevada, able to provide video at 30 frames per second with a 1280 by 720 display resolution. Polycom introduced its first high definition video conferencing system to the market in 2006. As of the 2010s, high definition resolution for videoconferencing became a popular feature, with most major suppliers in the videoconferencing market offering it.
Who produced the first high definition video conferencing system?
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The answer: LifeSize Communications

The problem: Answer a question about this article:
People from Plymouth are known as Plymothians or less formally as Janners. Its meaning is described as a person from Devon, deriving from Cousin Jan (the Devon form of John), but more particularly in naval circles anyone from the Plymouth area.
In Devon, Jan is another way of saying what common English name?
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The answer: John

The problem: Answer a question about this article:
The sovereignty of szlachta was ended in 1795 by Partitions of Poland, and until 1918 their legal status was dependent on policies of the Russian Empire, the Kingdom of Prussia or the Habsburg Monarchy.
When did the sovereignty of szlachta end?
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The answer:
1795