The problem: Answer a question about this article:
The Inequality-adjusted Human Development Index (IHDI) is a "measure of the average level of human development of people in a society once inequality is taken into account."
Does the IHDI measure the "average" or the "potential" level of human development?
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The answer: the average level


The problem: Answer a question about this article:
Most electrification systems use overhead wires, but third rail is an option up to about 1,200 V. Third rail systems exclusively use DC distribution. The use of AC is not feasible because the dimensions of a third rail are physically very large compared with the skin depth that the alternating current penetrates to (0.3 millimetres or 0.012 inches) in a steel rail). This effect makes the resistance per unit length unacceptably high compared with the use of DC. Third rail is more compact than overhead wires and can be used in smaller-diameter tunnels, an important factor for subway systems.
What is physically more compact tird rail or overhead wires?
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The answer: Third rail


The problem: Answer a question about this article:
The two finalists in 2011 were Lauren Alaina and Scotty McCreery, both teenage country singers. McCreery won the competition on May 25, being the youngest male winner and the fourth male in a row to win American Idol. McCreery released his first single, "I Love You This Big", as his coronation song, and Alaina released "Like My Mother Does". McCreery's debut album, Clear as Day, became the first debut album by an Idol winner to reach No. 1 on the US Billboard 200 since Ruben Studdard's Soulful in 2003, and he became the youngest male artist to reach No. 1 on the Billboard 200.
What is the name of the successful album that Ruben Studdard released in 2003?
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The answer: Soulful


The problem: Answer a question about this article:
Zinc is a chemical element with symbol Zn and atomic number 30. It is the first element of group 12 of the periodic table. In some respects zinc is chemically similar to magnesium: its ion is of similar size and its only common oxidation state is +2. Zinc is the 24th most abundant element in Earth's crust and has five stable isotopes. The most common zinc ore is sphalerite (zinc blende), a zinc sulfide mineral. The largest mineable amounts are found in Australia, Asia, and the United States. Zinc production includes froth flotation of the ore, roasting, and final extraction using electricity (electrowinning).
What is the oxidation state for zinc?
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The answer:
+2