The problem: Answer a question about this article:
Film speed is used in the exposure equations to find the appropriate exposure parameters. Four variables are available to the photographer to obtain the desired effect: lighting, film speed, f-number (aperture size), and shutter speed (exposure time). The equation may be expressed as ratios, or, by taking the logarithm (base 2) of both sides, by addition, using the APEX system, in which every increment of 1 is a doubling of exposure; this increment is commonly known as a "stop". The effective f-number is proportional to the ratio between the lens focal length and aperture diameter, the diameter itself being proportional to the square root of the aperture area. Thus, a lens set to f/1.4 allows twice as much light to strike the focal plane as a lens set to f/2. Therefore, each f-number factor of the square root of two (approximately 1.4) is also a stop, so lenses are typically marked in that progression: f/1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, etc.
What variables help the photographer produce the desired effect?
****
The answer: lighting, film speed, f-number (aperture size), and shutter speed (exposure time)

The problem: Answer a question about this article:
Seattle is widely considered one of the most liberal cities in the United States, even surpassing its neighbor, Portland, Oregon. Support for issues such as same-sex marriage and reproductive rights are largely taken for granted in local politics. In the 2012 U.S. general election, an overwhelming majority of Seattleites voted to approve Referendum 74 and legalize gay marriage in Washington state. In the same election, an overwhelming majority of Seattleites also voted to approve the legalization of the recreational use of cannabis in the state. Like much of the Pacific Northwest (which has the lowest rate of church attendance in the United States and consistently reports the highest percentage of atheism), church attendance, religious belief, and political influence of religious leaders are much lower than in other parts of America.
How does Seattle compare in church attendance to the rest oF the US?
****
The answer: much lower

The problem: Answer a question about this article:
With the emergence and growth of several science parks throughout the world that helped create many thousands of scientific, technological and knowledge-based businesses, Portugal started to develop several science parks across the country. These include the Taguspark (in Oeiras), the Coimbra iParque (in Coimbra), the biocant (in Cantanhede), the Madeira Tecnopolo (in Funchal), Sines Tecnopolo (in Sines), Tecmaia (in Maia) and Parkurbis (in Covilha). Companies locate in the Portuguese science parks to take advantage of a variety of services ranging from financial and legal advice through to marketing and technological support.
What are some examples of the science parks being built in Portugal?
****
The answer: Taguspark (in Oeiras), the Coimbra iParque (in Coimbra), the biocant (in Cantanhede), the Madeira Tecnopolo (in Funchal)

The problem: Answer a question about this article:
The central government estimates that over 7,000 inadequately engineered schoolrooms collapsed in the earthquake. Chinese citizens have since invented a catch phrase: "tofu-dregs schoolhouses" (Chinese: ), to mock both the quality and the quantity of these inferior constructions that killed so many school children. Due to the one-child policy, many families lost their only child when schools in the region collapsed during the earthquake. Consequently, Sichuan provincial and local officials have lifted the restriction for families whose only child was either killed or severely injured in the disaster. So-called "illegal children" under 18 years of age may be registered as legal replacements for their dead siblings; if the dead child was illegal, no further outstanding fines would apply. Reimbursement would not, however, be offered for fines that were already levied.
How many schoolrooms collapsed in the quake?
****
The answer:
7,000