Problem: Hydrostatic gauges (such as the mercury column manometer) consist of a vertical column of liquid in a tube whose ends are exposed to different pressures. The column will rise or fall until its weight is in equilibrium with the pressure differential between the two ends of the tube. The simplest design is a closed-end U-shaped tube, one side of which is connected to the region of interest. Any fluid can be used, but mercury is preferred for its high density and low vapour pressure. Simple hydrostatic gauges can measure pressures ranging from 1 torr (100 Pa) to above atmospheric. An important variation is the McLeod gauge which isolates a known volume of vacuum and compresses it to multiply the height variation of the liquid column. The McLeod gauge can measure vacuums as high as 10−6 torr (0.1 mPa), which is the lowest direct measurement of pressure that is possible with current technology. Other vacuum gauges can measure lower pressures, but only indirectly by measurement of other pressure-controlled properties. These indirect measurements must be calibrated via a direct measurement, most commonly a McLeod gauge.
An indirect measurement of pressure is most often calibrated by what?
The answer is the following: McLeod gauge

Problem: The television station, NDtv, grew from one show in 2002 to a full 24-hour channel with original programming by September 2006. WSND-FM serves the student body and larger South Bend community at 88.9 FM, offering students a chance to become involved in bringing classical music, fine arts and educational programming, and alternative rock to the airwaves. Another radio station, WVFI, began as a partner of WSND-FM. More recently, however, WVFI has been airing independently and is streamed on the Internet.
Which radio station provides radio to the students of Notre Dame at 88.9 FM?
The answer is the following: WSND-FM

Problem: Japan used the name Greater East Asia War (大東亜戦争, Dai Tō-A Sensō?), as chosen by a cabinet decision on 10 December 1941, to refer to both the war with the Western Allies and the ongoing war in China. This name was released to the public on 12 December, with an explanation that it involved Asian nations achieving their independence from the Western powers through armed forces of the Greater East Asia Co-Prosperity Sphere. Japanese officials integrated what they called the Japan–China Incident (日支事変, Nisshi Jihen?) into the Greater East Asia War.
What did Japanese officials call the war?
The answer is the following: Japan–China Incident

Problem: Balansiyya had a rebirth of sorts with the beginning of the Taifa of Valencia kingdom in the 11th century. The town grew, and during the reign of Abd al-Aziz a new city wall was built, remains of which are preserved throughout the Old City (Ciutat Vella) today. The Castilian nobleman Rodrigo Diaz de Vivar, known as El Cid, who was intent on possessing his own principality on the Mediterranean, entered the province in command of a combined Christian and Moorish army and besieged the city beginning in 1092. By the time the siege ended in May 1094, he had carved out his own fiefdom—which he ruled from 15 June 1094 to July 1099. This victory was immortalised in the Lay of the Cid. During his rule, he converted nine mosques into churches and installed the French monk Jérôme as bishop of the See of Valencia. El Cid was killed in July 1099 while defending the city from an Almoravid siege, whereupon his wife Ximena Díaz ruled in his place for two years.
When did El Cid rule?
The answer is the following:
15 June 1094 to July 1099