Problem: Glass has the ability to refract, reflect, and transmit light following geometrical optics, without scattering it. It is used in the manufacture of lenses and windows. Common glass has a refraction index around 1.5. This may be modified by adding low-density materials such as boron, which lowers the index of refraction (see crown glass), or increased (to as much as 1.8) with high-density materials such as (classically) lead oxide (see flint glass and lead glass), or in modern uses, less toxic oxides of zirconium, titanium, or barium. These high-index glasses (inaccurately known as "crystal" when used in glass vessels) cause more chromatic dispersion of light, and are prized for their diamond-like optical properties.
What can be used to make glass less refractive?
The answer is the following: boron

Problem: Namibia conducts a census every ten years. After independence the first Population and Housing Census was carried out in 1991, further rounds followed in 2001 and 2011. The data collection method is to count every person resident in Namibia on the census reference night, wherever they happen to be. This is called the de facto method. For enumeration purposes the country is demarcated into 4,042 enumeration areas. These areas do not overlap with constituency boundaries to get reliable data for election purposes as well.
The enumeration areas in Namibia do not overlap with what in order to get reliable data?
The answer is the following: constituency boundaries

Problem: College sports are also popular in North Carolina, with 18 schools competing at the Division I level. The Atlantic Coast Conference (ACC) is headquartered in Greensboro, and both the ACC Football Championship Game (Charlotte) and the ACC Men's Basketball Tournament (Greensboro) were most recently held in North Carolina. College basketball in particular is very popular, buoyed by the Tobacco Road rivalries between Duke, North Carolina, North Carolina State, and Wake Forest. The ACC Championship Game and The Belk Bowl are held annually in Charlotte's Bank of America Stadium, featuring teams from the ACC and the Southeastern Conference. Additionally, the state has hosted the NCAA Men's Basketball Final Four on two occasions, in Greensboro in 1974 and in Charlotte in 1994.
How many colleges compete at the Division 1 level in North Carolina?
The answer is the following: 18

Problem: Greek Cypriots and Turkish Cypriots share a lot in common in their culture but also have differences. Several traditional food (such as souvla and halloumi) and beverages are similar, as well as expressions and ways of life. Hospitality and buying or offering food and drinks for guests or others are common among both. In both communities, music, dance and art are integral parts of social life and many artistic, verbal and nonverbal expressions, traditional dances such as tsifteteli, similarities in dance costumes and importance placed on social activities are shared between the communities. However, the two communities have distinct religions and religious cultures, with the Greek Cypriots traditionally being Greek Orthodox and Turkish Cypriots traditionally being Sunni Muslims, which has partly hindered cultural exchange. Greek Cypriots have influences from Greece and Christianity, while Turkish Cypriots have influences from Turkey and Islam.
Which art forms are integral parts of everyday life?
The answer is the following:
music, dance and art