The problem: Answer a question about this article:
The New York City Fire Department faces highly multifaceted firefighting challenges in many ways unique to New York. In addition to responding to building types that range from wood-frame single family homes to high-rise structures, there are many secluded bridges and tunnels, as well as large parks and wooded areas that can give rise to brush fires. New York is also home to one of the largest subway systems in the world, consisting of hundreds of miles of tunnel with electrified track.
New York is home to what largest transportation system in the world?
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The answer: subway systems

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The panel is eventually broken apart into individual PCBs; this is called depaneling. Separating the individual PCBs is frequently aided by drilling or routing perforations along the boundaries of the individual circuits, much like a sheet of postage stamps. Another method, which takes less space, is to cut V-shaped grooves across the full dimension of the panel. The individual PCBs can then be broken apart along this line of weakness. Today depaneling is often done by lasers which cut the board with no contact. Laser panelization reduces stress on the fragile circuits.
What does the V-shaped groove method save?
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The answer: space

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As of 2013, the American Idol alumni in their post-Idol careers have amassed over 59 million albums and 120 million singles and digital track downloads in the United States alone.
How many singles and digital downloads have Idol contestants created as of 2013?
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The answer: 120 million

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In a video posted on July 21, 2009, YouTube software engineer Peter Bradshaw announced that YouTube users can now upload 3D videos. The videos can be viewed in several different ways, including the common anaglyph (cyan/red lens) method which utilizes glasses worn by the viewer to achieve the 3D effect. The YouTube Flash player can display stereoscopic content interleaved in rows, columns or a checkerboard pattern, side-by-side or anaglyph using a red/cyan, green/magenta or blue/yellow combination. In May 2011, an HTML5 version of the YouTube player began supporting side-by-side 3D footage that is compatible with Nvidia 3D Vision.
What type of videos did youtube officially start supporting in July 2009?
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The answer:
3D