Problem: Washington University in St. Louis:

During the latter half of the 20th century, Washington University transitioned from a strong regional university to a national research institution. In 1957, planning began for the construction of the "South 40," a complex of modern residential halls. With the additional on-campus housing, Washington University, which had been predominantly a "streetcar college" of commuter students, began to attract a more national pool of applicants. By 1964, over two-thirds of incoming students came from outside the St. Louis area.

When did Washington University transition to a national research institution?
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A: During the latter half of the 20th century,

Problem: Aspirated consonant:

In many languages, such as Armenian, Korean, Thai, Indo-Aryan languages, Dravidian languages, Icelandic, Ancient Greek, and the varieties of Chinese, tenuis and aspirated consonants are phonemic. Unaspirated consonants like [p s] and aspirated consonants like [p p s] are separate phonemes, and words are distinguished by whether they have one or the other.

An example of an unaspirated stop is?
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A: unanswerable

Problem: Republic of the Congo:

Sassou also won the following presidential election in July 2009. According to the Congolese Observatory of Human Rights, a non-governmental organization, the election was marked by "very low" turnout and "fraud and irregularities".

What kind of turnout did the Congolese Observatory of Human Rights experience in the 2009 elections?
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A: very low

Problem: Space Race:

In May 1972, President Richard M. Nixon and Soviet Premier Leonid Brezhnev negotiated an easing of relations known as detente, creating a temporary "thaw" in the Cold War. In the spirit of good sportsmanship, the time seemed right for cooperation rather than competition, and the notion of a continuing "race" began to subside.

When did President Nixon and Brezhnev of the USSR end the Cold War?
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A:
May 1972