Input: Read this: Charles Pollak (born Karol Pollak), the inventor of the first electrolytic capacitors, found out that the oxide layer on an aluminum anode remained stable in a neutral or alkaline electrolyte, even when the power was switched off. In 1896 he filed a patent for an "Electric liquid capacitor with aluminum electrodes." Solid electrolyte tantalum capacitors were invented by Bell Laboratories in the early 1950s as a miniaturized and more reliable low-voltage support capacitor to complement their newly invented transistor.
Question: What happened in 1899?

Output: unanswerable


Input: Read this: Additionally, cable-ready TV sets can display HD content without using an external box. They have a QAM tuner built-in and/or a card slot for inserting a CableCARD.
Question: What kind of card will allow a cable-ready TV to display HD content without an external box?

Output: CableCARD


Input: Read this: The Appalachians are also home to two species of fir, the boreal balsam fir (Abies balsamea), and the southern high elevation endemic, Fraser fir (Abies fraseri). Fraser fir is confined to the highest parts of the southern Appalachian Mountains, where along with red spruce it forms a fragile ecosystem known as the Southern Appalachian spruce-fir forest. Fraser fir rarely occurs below 5,500 ft (1,700 m), and becomes the dominant tree type at 6,200 ft (1,900 m). By contrast, balsam fir is found from near sea level to the tree line in the northern Appalachians, but ranges only as far south as Virginia and West Virginia in the central Appalachians, where it is usually confined above 3,900 ft (1,200 m) asl, except in cold valleys. Curiously, it is associated with oaks in Virginia. The balsam fir of Virginia and West Virginia is thought by some to be a natural hybrid between the more northern variety and Fraser fir. While red spruce is common in both upland and bog habitats, balsam fir, as well as black spruce and tamarack, are more characteristic of the latter. However balsam fir also does well in soils with a pH as high as 6.
Question: What is the lowest asl oaks are usually found at?

Output: unanswerable


Input: Read this: Spectre was released on 26 October 2015 in the United Kingdom on the same night as the world premiere at the Royal Albert Hall in London, followed by a worldwide release. It was released in the United States on 6 November 2015. It became the second James Bond film to be screened in IMAX venues after Skyfall, although it was not filmed with IMAX cameras. Spectre received mixed reviews upon its release; although criticised for its length, lack of screen time for new characters, and writing, it received praise for its action sequences and cinematography. The theme song, "Writing's on the Wall", received mixed reviews, particularly compared to the previous theme; nevertheless, it won the Golden Globe for Best Original Song and was nominated for the Academy Award in the same category. As of 20 February 2016[update], Spectre has grossed over $879 million worldwide.
Question: Where was the first screening of Spectre?

Output:
Royal Albert Hall in London