Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Machine vision systems often require bright and homogeneous illumination, so features of interest are easier to process. LEDs are often used for this purpose, and this is likely to remain one of their major uses until the price drops low enough to make signaling and illumination uses more widespread. Barcode scanners are the most common example of machine vision, and many low cost products use red LEDs instead of lasers. Optical computer mice are an example of LEDs in machine vision, as it is used to provide an even light source on the surface for the miniature camera within the mouse. LEDs constitute a nearly ideal light source for machine vision systems for several reasons:
 non-LEDs are often used for what type of systems?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The Farmington Canal Trail is a rail trail that will eventually run continuously from downtown New Haven to Northampton, Massachusetts. The scenic trail follows the path of the historic New Haven and Northampton Company and the Farmington Canal. Currently, there is a continuous 14-mile (23 km) stretch of the trail from downtown, through Hamden and into Cheshire, making bicycle commuting between New Haven and those suburbs possible. The trail is part of the East Coast Greenway, a proposed 3,000-mile (4,800 km) bike path that would link every major city on the East Coast from Florida to Maine.
What historic trail does the Farmington Canal Trail follow? 
A: New Haven and Northampton Company

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Bermuda has developed a proud Rugby Union community. The Bermuda Rugby Union team won the 2011 Caribbean championships, defeating Guyana in the final. They previously beat The Bahamas and Mexico to take the crown. Rugby 7's is also played, with four rounds scheduled to take place in the 2011–2012 season. The Bermuda 7's team competed in the 2011 Las Vegas 7's, defeating the Mexican team. There are four clubs on the island: (1) Police (2) Mariners (3) Teachers (4) Renegades. There is a men's and women's competition–current league champions are Police (Men) (winning the title for the first time since the 1990s) and Renegades (women's). Games are currently played at Warwick Academy. Bermuda u/19 team won the 2010 Caribbean Championships.
Who won the 2011 Guyana Championships?
A: unanswerable

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Classified as a Subtropical Mediterranean climate (Köppen Csb), Santa Monica enjoys an average of 310 days of sunshine a year. It is located in USDA plant hardiness zone 11a. Because of its location, nestled on the vast and open Santa Monica Bay, morning fog is a common phenomenon in May, June and early July (caused by ocean temperature variations and currents). Like other inhabitants of the greater Los Angeles area, residents have a particular terminology for this phenomenon: the "May Gray" and the "June Gloom". Overcast skies are common during June mornings, but usually the strong sun burns the fog off by noon. In the late winter/early summer, daily fog is a phenomenon too. It happens suddenly and it may last some hours or past sunset time. Nonetheless, it will sometimes stay cloudy and cool all day during June, even as other parts of the Los Angeles area enjoy sunny skies and warmer temperatures. At times, the sun can be shining east of 20th Street, while the beach area is overcast. As a general rule, the beach temperature is from 5 to 10 degrees Fahrenheit (3 to 6 degrees Celsius) cooler than it is inland during summer days, and 5–10 degrees warmer during winter nights.
What have locals coined the morning time in May?
A:
"May Gray"