Problem: A solar balloon is a black balloon that is filled with ordinary air. As sunlight shines on the balloon, the air inside is heated and expands causing an upward buoyancy force, much like an artificially heated hot air balloon. Some solar balloons are large enough for human flight, but usage is generally limited to the toy market as the surface-area to payload-weight ratio is relatively high.
What happens when sunlight shines on a solar balloon?
The answer is the following: the air inside is heated and expands causing an upward buoyancy force

Problem: In Japan, an institute of technology (, kogyo daigaku?) is a type of university that specializes in the sciences. See also the Imperial College of Engineering, which was the forerunner of the University of Tokyo's engineering faculty.
What college was the forerunner for the engineering faculty at the University of Tokyo?
The answer is the following: Imperial College of Engineering

Problem: A microbrewery, or craft brewery, produces a limited amount of beer. The maximum amount of beer a brewery can produce and still be classed as a microbrewery varies by region and by authority, though is usually around 15,000 barrels (1.8 megalitres, 396 thousand imperial gallons or 475 thousand US gallons) a year. A brewpub is a type of microbrewery that incorporates a pub or other eating establishment. The highest density of breweries in the world, most of them microbreweries, exists in the German Region of Franconia, especially in the district of Upper Franconia, which has about 200 breweries. The Benedictine Weihenstephan Brewery in Bavaria, Germany, can trace its roots to the year 768, as a document from that year refers to a hop garden in the area paying a tithe to the monastery. The brewery was licensed by the City of Freising in 1040, and therefore is the oldest working brewery in the world.
What year was The Benedictine Weihenstephan Brewery first licensed as a brewery?
The answer is the following: 1040

Problem: Davis and his cabinet left the city by train that night, as government officials burned documents and departing Confederate troops burned tobacco and other warehouses to deny their contents to the victors. On April 2, 1865, General Godfrey Weitzel, commander of the 25th corps of the United States Colored Troops, accepted the city's surrender from the mayor and group of leading citizens who remained. The Union troops eventually managed to stop the raging fires but about 25% of the city's buildings were destroyed-
On what day did the Confederacy surrender Richmond to the Union?
The answer is the following:
April 2, 1865