Problem: North Carolina:

In 1899 the state legislature passed a new constitution, with requirements for poll taxes and literacy tests for voter registration which disfranchised most black Americans in the state. Exclusion from voting had wide effects: it meant that black Americans could not serve on juries or in any local office. After a decade of white supremacy, many people forgot that North Carolina had ever had thriving middle-class black Americans. Black citizens had no political voice in the state until after the federal Civil Rights Act of 1964 and Voting Rights Act of 1965 were passed to enforce their constitutional rights. It was not until 1992 that another African American was elected as a US Representative from North Carolina.

Being excluded from doing what, made it so that black people could not serve on juries or in public office?
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A: voting

Problem: Incandescent light bulb:

One of the problems of the standard electric light bulb is filament notching due to evaporation of the filament. Small variations in resistivity along the filament cause "hot spots" to form at points of higher resistivity; a variation of diameter of only 1% will cause a 25% reduction in service life. These hot spots evaporate faster than the rest of the filament, which increases the resistance at that pointthis creates a positive feedback that ends in the familiar tiny gap in an otherwise healthy-looking filament. Irving Langmuir found that an inert gas, instead of vacuum, would retard evaporation. General service incandescent light bulbs over about 25 watts in rating are now filled with a mixture of mostly argon and some nitrogen, or sometimes krypton. Lamps operated on direct current develop random stairstep irregularities on the filament surface which may cut lifespan in half compared to AC operation; different alloys of tungsten and rhenium can be used to counteract the effect.

Which gases are typically used in a light bulb?
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A: argon and some nitrogen, or sometimes krypton

Problem: Alsace:

From the annexation of Alsace by France in the 17th century and the language policy of the French Revolution up to 1870, knowledge of French in Alsace increased considerably. With the education reforms of the 19th century, the middle classes began to speak and write French well. The French language never really managed, however, to win over the masses, the vast majority of whom continued to speak their German dialects and write in German (which we would now call "standard German").[citation needed]

When did French become the most common language?
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A: unanswerable

Problem: Bern:

Bern has an area, as of 2009[update], of 51.62 square kilometers (19.93 sq mi). Of this area, 9.79 square kilometers (3.78 sq mi) or 19.0% is used for agricultural purposes, while 17.33 square kilometers (6.69 sq mi) or 33.6% is forested. Of the rest of the land, 23.25 square kilometers (8.98 sq mi) or 45.0% is settled (buildings or roads), 1.06 square kilometers (0.41 sq mi) or 2.1% is either rivers or lakes and 0.16 square kilometers (0.062 sq mi) or 0.3% is unproductive land.

When was the last time the area of Bern was measured?
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A:
2009