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  2. Superliner (railcar) - Wikipedia

    en.wikipedia.org/wiki/Superliner_(railcar)

    The Superliner is a type of bilevel intercity railroad passenger car used by Amtrak, the national rail passenger carrier in the United States.Amtrak commissioned the cars to replace older single-level cars on its long-distance trains in the Western United States.

  3. Kennedy Space Center Launch Complex 39A - Wikipedia

    en.wikipedia.org/wiki/Kennedy_Space_Center...

    Launch Complex 39A (LC-39A) is the first of Launch Complex 39's three launch pads, located at NASA's Kennedy Space Center in Merritt Island, Florida.The pad, along with Launch Complex 39B, was first constructed in the 1960s to accommodate the Saturn V launch vehicle, and has been used to support NASA crewed space flight missions, including the historic Apollo 11 moon landing and the Space Shuttle.

  4. Gemini 2 - Wikipedia

    en.wikipedia.org/wiki/Gemini_2

    Gemini spacecraft no. 2 was the first craft to make more than one spaceflight since the X-15, and the only one until Space Shuttle Columbia flew its second mission in 1981; it would also be the only space capsule to be reused until Crew Dragon Endeavour was launched a second time in 2021.

  5. Domain Name System - Wikipedia

    en.wikipedia.org/wiki/Domain_Name_System

    The Internet maintains two principal namespaces, the domain name hierarchy and the IP address spaces. [2] The Domain Name System maintains the domain name hierarchy and provides translation services between it and the address spaces. Internet name servers and a communication protocol implement the Domain Name System. A DNS name server is a ...

  6. Interchange (road) - Wikipedia

    en.wikipedia.org/wiki/Interchange_(road)

    The High Five in Dallas, Texas.This is a complicated five-level stack interchange, due to the proximity of frontage roads and segregated high-occupancy vehicle lanes.This hybrid design is based on parts of a four-level stack for highways, with a three-level-diamond interchange to handle the frontage roads.

  7. Air Force Specialty Code - Wikipedia

    en.wikipedia.org/wiki/Air_Force_Specialty_Code

    The Air Force Specialty Code (AFSC) is an alphanumeric code used by the United States Air Force to identify a specific job. Officer AFSCs consist of four characters and enlisted AFSCs consist of five characters.

  8. 2-satisfiability - Wikipedia

    en.wikipedia.org/wiki/2-satisfiability

    2-satisfiability is NL-complete, [30] meaning that it is one of the "hardest" or "most expressive" problems in the complexity class NL of problems solvable nondeterministically in logarithmic space. Completeness here means that a deterministic Turing machine using only logarithmic space can transform any other problem in NL into an equivalent 2 ...