Short answers, pulled from the story.
The Czech language contains the letter ř which represents a raised alveolar non-sonorant trill that exists in no other language. This unique phoneme serves as the auditory signature of the Czech language and is found only in dialects of Kashubian and formerly in Polish.
The publication of the Kralice Bible occurred between the 2nd of May 1579 and the 31st of December 1593. This six-volume work was the first complete translation of the Bible into Czech from the original languages and became the model for the standard language for centuries to follow.
The linguist Josef Dobrovský published the German-language grammar titled Comprehensive Doctrine of the Bohemian Language in 1809. Although Dobrovský believed that Czech had no realistic chance of returning as a major language, his work became the catalyst for the Czech National Revival.
Common Czech is spoken by about two-thirds of the population in the Czech lands. This interdialect is based on the vernacular of Prague and represents the majority of speakers despite the existence of varied Moravian dialects.
While numbers one through four allow nouns and adjectives to take any case, numbers over five require subject and direct object noun phrases to be declined in the genitive plural instead of the nominative or accusative. This rule means that the phrase five Czech crowns were is grammatically distinct from one Czech crown was with the verb changing from singular to plural.
The dissolution of Czechoslovakia occurred in 1993 and marked a turning point in the relationship between Czech and Slovak. Following the split, mutual intelligibility declined for younger speakers because Czech speakers began to experience less exposure to Slovak and vice versa.