The problem: Answer a question about this article:
Opponents argue that the death penalty is not an effective means of deterring crime, risks the execution of the innocent, is unnecessarily barbaric in nature, cheapens human life, and puts a government on the same base moral level as those criminals involved in murder. Furthermore, some opponents argue that the arbitrariness with which it is administered and the systemic influence of racial, socio-economic, geographic, and gender bias on determinations of desert make the current practice of capital punishment immoral and illegitimate.
Along with gender, geography and race, what bias do some opponents of the death penalty see in its administration?
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The answer: socio-economic

The problem: Answer a question about this article:
The most expensive part of a CD is the jewel case. In 1995, material costs were 30 cents for the jewel case and 10 to 15 cents for the CD. Wholesale cost of CDs was $0.75 to $1.15, which retailed for $16.98. On average, the store received 35 percent of the retail price, the record company 27 percent, the artist 16 percent, the manufacturer 13 percent, and the distributor 9 percent. When 8-track tapes, cassette tapes, and CDs were introduced, each was marketed at a higher price than the format they succeeded, even though the cost to produce the media was reduced. This was done because the apparent value increased. This continued from vinyl to CDs but was broken when Apple marketed MP3s for $0.99, and albums for $9.99. The incremental cost, though, to produce an MP3 is very small.
What is the priciest component of a CD?
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The answer: jewel case

The problem: Answer a question about this article:
A elevator of this kind uses a vacuum on top of the cab and a valve on the top of the "shaft" to move the cab upwards and closes the valve in order to keep the cab at the same level. a diaphragm or a piston is used as a "brake" if there's a sudden increase in pressure avove the cab. however, to go down, it opens the valve so that the air can pressurize the top of the "shaft", allowing the cab to go down by its own weight. this also means that in case of a power failure, the cab will automatically go down. the "shaft" is made of acrilic, is always round, due to the shape of the vacuum pump turbine. in order to keep the air inside of the cab, rubber seals are used. due to technical limitations, these elevators have a low capacity. they usually allow 1-3 passengers and up to 525 lbs.
How does it enable the cab to go down by it's own weight?
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The answer: it opens the valve so that the air can pressurize the top of the "shaft"

The problem: Answer a question about this article:
First recognized in 1900 by Max Planck, it was originally the proportionality constant between the minimal increment of energy, E, of a hypothetical electrically charged oscillator in a cavity that contained black body radiation, and the frequency, f, of its associated electromagnetic wave. In 1905 the value E, the minimal energy increment of a hypothetical oscillator, was theoretically associated by Einstein with a "quantum" or minimal element of the energy of the electromagnetic wave itself. The light quantum behaved in some respects as an electrically neutral particle, as opposed to an electromagnetic wave. It was eventually called the photon.
What was later termed the photon?
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The answer:
The light quantum