QUES: Upon exposure, the amount of light energy that reaches the film determines the effect upon the emulsion. If the brightness of the light is multiplied by a factor and the exposure of the film decreased by the same factor by varying the camera's shutter speed and aperture, so that the energy received is the same, the film will be developed to the same density. This rule is called reciprocity. The systems for determining the sensitivity for an emulsion are possible because reciprocity holds. In practice, reciprocity works reasonably well for normal photographic films for the range of exposures between 1/1000 second to 1/2 second. However, this relationship breaks down outside these limits, a phenomenon known as reciprocity failure.

How is the brightness of a light changed?
What is the answer?
ANS: unanswerable
QUES: Atypical symptoms are more frequently reported by women, the elderly, and those with diabetes when compared to their male and younger counterparts. Women also report more numerous symptoms compared with men (2.6 on average vs. 1.8 symptoms in men). The most common symptoms of MI in women include dyspnea, weakness, and fatigue. Fatigue, sleep disturbances, and dyspnea have been reported as frequently occurring symptoms that may manifest as long as one month before the actual clinically manifested ischemic event. In women, chest pain may be less predictive of coronary ischemia than in men. Women may also experience back or jaw pain during an episode.

How long after the ischemic event do symptoms manifest?
What is the answer?
ANS: unanswerable
QUES: Between 1999 and 2006, Bicycling magazine named Boston three times as one of the worst cities in the US for cycling; regardless, it has one of the highest rates of bicycle commuting. In 2008, as a consequence of improvements made to bicycling conditions within the city, the same magazine put Boston on its "Five for the Future" list as a "Future Best City" for biking, and Boston's bicycle commuting percentage increased from 1% in 2000 to 2.1% in 2009. The bikeshare program called Hubway launched in late July 2011, logging more than 140,000 rides before the close of its first season. The neighboring municipalities of Cambridge, Somerville, and Brookline joined the Hubway program in summer 2012.

What year did Hubway launch?
What is the answer?
ANS:
2011