input question: Extract the answer to the question from the following context. Question: palladium disks are primarily used for removing what Context: Hydrogen is highly soluble in many rare earth and transition metals and is soluble in both nanocrystalline and amorphous metals. Hydrogen solubility in metals is influenced by local distortions or impurities in the crystal lattice. These properties may be useful when hydrogen is purified by passage through hot palladium disks, but the gas's high solubility is a metallurgical problem, contributing to the embrittlement of many metals, complicating the design of pipelines and storage tanks.???
output answer: impurities

input question: Extract the answer to the question from the following context. Question: What, in the article, happened about a year before the trophy was presented to the National Football Museum in Preston? Context: After being rendered obsolete by the redesign, the 1895 replica was presented in 1910 to the FA's long-serving president Lord Kinnaird. Kinnaird died in 1923, and his family kept it in their possession, out of view, until putting it up for auction in 2005. It was duly sold at Christie's auction house on 19 May 2005 for 420,000 (478,400 including auction fees and taxes). The sale price set a new world record for a piece of football memorabilia, surpassing the 254,000 paid for the Jules Rimet World Cup Trophy in 1997. The successful bidder was David Gold, the then joint chairman of Birmingham City; claiming the FA and government were doing nothing proactive to ensure the trophy remained in the country, Gold stated his purchase was motivated by wanting to save it for the nation. Accordingly, Gold presented the trophy to the National Football Museum in Preston on 20 April 2006, where it went on immediate public display. It later moved with the museum to its new location in Manchester. In November 2012, it was ceremonially presented to Royal Engineers, after they beat Wanderers 71 in a charity replay of the first FA Cup final.???
output answer: It was duly sold at Christie's auction house

input question: Extract the answer to the question from the following context. Question: Which area was conquered second, Syria or Persia? Context: Religious beliefs in the Eastern Empire and Persia were in flux during the late 6th and early 7th centuries. Judaism was an active proselytising faith, and at least one Arab political leader converted to it.[J] Christianity had active missions competing with the Persians' Zoroastrianism in seeking converts, especially among residents of the Arabian Peninsula. All these strands came together with the emergence of Islam in Arabia during the lifetime of Muhammad (d. 632). After his death, Islamic forces conquered much of the Eastern Empire and Persia, starting with Syria in 634635 and reaching Egypt in 640641, Persia between 637 and 642, North Africa in the later 7th century, and the Iberian Peninsula in 711. By 714, Islamic forces controlled much of the peninsula in a region they called Al-Andalus.???
output answer: Persia

input question: Extract the answer to the question from the following context. Question: Who prayed to the icons? Context: Some researchers believe that the first Russian settlement in Alaska was established in the 17th century. According to this hypothesis, in 1648 several koches of Semyon Dezhnyov's expedition came ashore in Alaska by storm and founded this settlement. This hypothesis is based on the testimony of Chukchi geographer Nikolai Daurkin, who had visited Alaska in 17641765 and who had reported on a village on the Kheuveren River, populated by "bearded men" who "pray to the icons". Some modern researchers associate Kheuveren with Koyuk River.???
output answer:
Russian settlement in Alaska