Please answer this: Determine the topic of the question-answer pair. Question: "what are some chinese inventions?"; Answer: "The Chinese invented technologies involving mechanics , hydraulics , and mathematics applied to horology , metallurgy , astronomy , agriculture , engineering , music theory , craftsmanship , nautics , and warfare ."? Topic:
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Answer: List of Chinese inventions

Problem: Determine the topic of the question-answer pair. Question: "what is a league in the sea?"; Answer: "In the context of nautical distances, the 3 mile (4.8 km) distance corresponds to how far an observer of average height (5'9" or 1.78 m) can see when standing at sea level."? Topic:

A: League (unit)

Problem: Given the question: Determine the topic of the question-answer pair. Question: "when does v start?"; Answer: "V is an American science fiction television series that ran for two seasons on ABC , from November 3, 2009 to March 15, 2011."? Topic:
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The answer is:
V (2009 TV series)

input question: Determine the topic of the question-answer pair. Question: "Who Moved My Cheese Synopsis?"; Answer: "It describes change in one's work and life, and four typical reactions to said change by two mice and two "littlepeople", during their hunt for cheese ."? Topic:???
output answer: Who Moved My Cheese?

Determine the topic of the question-answer pair. Question: "where does the expression "knocking on wood" come from?"; Answer: "Knocking on wood, or to touch wood, refers to the apotropaic tradition in western folklore of literally touching/knocking on wood, or merely stating that you are doing or intend same, in order to avoid " tempting fate " after making a favourable observation, a boast, or declaration concerning one's own death."? Topic:
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Answer: Knocking on wood

Q: Determine the topic of the question-answer pair. Question: "how is hydrogen produced?"; Answer: "Currently the dominant technology for direct production is steam reforming from hydrocarbons ."? Topic:
A:
Hydrogen production