Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Lighting or illumination is the deliberate use of light to achieve a practical or aesthetic effect. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight. Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings. This can save energy in place of using artificial lighting, which represents a major component of energy consumption in buildings. Proper lighting can enhance task performance, improve the appearance of an area, or have positive psychological effects on occupants.
What is the used to achieve a practical effect?
A: Lighting or illumination

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Southeast Raleigh is bounded by downtown on the west, Garner on the southwest, and rural Wake County to the southeast. The area includes areas along Rock Quarry Road, Poole Road, and New Bern Avenue. Primary neighborhoods include Chastain, Chavis Heights, Raleigh Country Club, Southgate, Kingwood Forest, Rochester Heights, Emerald Village and Biltmore Hills. Time Warner Cable Music Pavilion (formerly Alltel Pavilion and Walnut Creek Amphitheatre) is one of the region's major outdoor concert venues and is located on Rock Quarry Road. Shaw University is located in this part of the city.
What is to the north of Southeast Raleigh?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
There are at least 3,223 named lakes and reservoirs in Montana, including Flathead Lake, the largest natural freshwater lake in the western United States. Other major lakes include Whitefish Lake in the Flathead Valley and Lake McDonald and St. Mary Lake in Glacier National Park. The largest reservoir in the state is Fort Peck Reservoir on the Missouri river, which is contained by the second largest earthen dam and largest hydraulically filled dam in the world. Other major reservoirs include Hungry Horse on the Flathead River; Lake Koocanusa on the Kootenai River; Lake Elwell on the Marias River; Clark Canyon on the Beaverhead River; Yellowtail on the Bighorn River, Canyon Ferry, Hauser, Holter, Rainbow; and Black Eagle on the Missouri River.
How many named lakes are there in Montana?
A: at least 3,223

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The Tibetan Empire emerged in the 7th century, but with the fall of the empire the region soon divided into a variety of territories. The bulk of western and central Tibet (U-Tsang) was often at least nominally unified under a series of Tibetan governments in Lhasa, Shigatse, or nearby locations; these governments were at various times under Mongol and Chinese overlordship. The eastern regions of Kham and Amdo often maintained a more decentralized indigenous political structure, being divided among a number of small principalities and tribal groups, while also often falling more directly under Chinese rule after the Battle of Chamdo; most of this area was eventually incorporated into the Chinese provinces of Sichuan and Qinghai. The current borders of Tibet were generally established in the 18th century.
What empire emerged in the 18th century?
A:
unanswerable