Input: Read this: In the late 1980s, key breakthroughs in GaN epitaxial growth and p-type doping ushered in the modern era of GaN-based optoelectronic devices. Building upon this foundation, Dr. Moustakas at Boston University patented a method for producing high-brightness blue LEDs using a new two-step process. Two years later, in 1993, high-brightness blue LEDs were demonstrated again by Shuji Nakamura of Nichia Corporation using a gallium nitride growth process similar to Dr. Moustakas's. Both Dr. Moustakas and Mr. Nakamura were issued separate patents, which confused the issue of who was the original inventor (partly because although Dr. Moustakas invented his first, Dr. Nakamura filed first).[citation needed] This new development revolutionized LED lighting, making high-power blue light sources practical, leading to the development of technologies like BlueRay, as well as allowing the bright high resolution screens of modern tablets and phones.[citation needed]
Question: Who first patented a method to produce high-brightness red LEDs?

Output: unanswerable

QUES: Until the 1960s the piers at Weston-super-Mare, Clevedon, Portishead and Minehead were served by the paddle steamers of P and A Campbell who ran regular services to Barry and Cardiff as well as Ilfracombe and Lundy Island. The pier at Burnham-on-Sea was used for commercial goods, one of the reasons for the Somerset and Dorset Joint Railway was to provide a link between the Bristol Channel and the English Channel. The pier at Burnham-on-Sea is the shortest pier in the UK. In the 1970s the Royal Portbury Dock was constructed to provide extra capacity for the Port of Bristol.

What is the longest pier in Somerset?
What is the answer?
ANS: unanswerable

QUES: The first half of the 20th century in Russia and the Soviet Union was marked by a succession of wars, famines and other disasters, each accompanied by large-scale population losses. Stephen J. Lee estimates that, by the end of World War II in 1945, the Russian population was about 90 million fewer than it could have been otherwise.
Who ended the war in 1945?

ANS: unanswerable

According to the International Organization for Migration, Nigeria witnessed a dramatic increase in remittances sent home from overseas Nigerians, going from USD 2.3 billion in 2004 to 17.9 billion in 2007. The United States accounts for the largest portion of official remittances, followed by the United Kingdom, Italy, Canada, Spain and France. On the African continent, Egypt, Equatorial Guinea, Chad, Libya and South Africa are important source countries of remittance flows to Nigeria, while China is the biggest remittance-sending country in Asia.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Which country has Nigerians sending the second-most money home?
Ah, so.. United Kingdom

Question: Unlike other European nations, the Dutch chose not to follow a policy of language expansion amongst the indigenous peoples of their colonies. In the last quarter of the 19th century, however, a local elite gained proficiency in Dutch so as to meet the needs of expanding bureaucracy and business. Nevertheless, the Dutch government remained reluctant to teach Dutch on a large scale for fear of destabilising the colony. Dutch, the language of power, was supposed to remain in the hands of the leading elite.
Try to answer this question if possible: Towards the end of what century did it become important for more people in Dutch colonies to speak Dutch?
Answer: 19th

Input: Read this: In Canada, "the 51st state" is a phrase generally used in such a way as to imply that if a certain political course is taken, Canada's destiny will be as little more than a part of the United States. Examples include the Canada-United States Free Trade Agreement in 1988, the debate over the creation of a common defense perimeter, and as a potential consequence of not adopting proposals intended to resolve the issue of Quebec sovereignty, the Charlottetown Accord in 1992 and the Clarity Act in 1999.
Question: When was the Charlottetown Accord signed?

Output:
1992