The problem: Answer a question about this article:
When the U.S. entered World War I he immediately requested an overseas assignment but was again denied and then assigned to Ft. Leavenworth, Kansas. In February 1918 he was transferred to Camp Meade in Maryland with the 65th Engineers. His unit was later ordered to France but to his chagrin he received orders for the new tank corps, where he was promoted to brevet Lieutenant Colonel in the National Army. He commanded a unit that trained tank crews at Camp Colt his first command at the site of "Pickett's Charge" on the Gettysburg, Pennsylvania Civil War battleground. Though Eisenhower and his tank crews never saw combat, he displayed excellent organizational skills, as well as an ability to accurately assess junior officers' strengths and make optimal placements of personnel.
What unit did Eisenhower serve with at Camp Meade?
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The answer: 65th Engineers

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The London Underground in England is one of the few networks that uses a four-rail system. The additional rail carries the electrical return that, on third rail and overhead networks, is provided by the running rails. On the London Underground, a top-contact third rail is beside the track, energized at +420v DC, and a top-contact fourth rail is located centrally between the running rails at 210v DC, which combine to provide a traction voltage of 630v DC. London Underground is now upgrading its fourth rail system to 750v DC with a positive conductor rail energised to +500v DC and a negative conductor rail energised to -250v DC. However, many older sections in tunnels are still energised to 630v DC. The same system was used for Milan's earliest underground line, Milan Metro's line 1, whose more recent lines use an overhead catenary or a third rail.
What is the purpose of the forth rail?
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The answer: carries the electrical return

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Beyonce is believed to have first started a relationship with Jay Z after a collaboration on "'03 Bonnie & Clyde", which appeared on his seventh album The Blueprint 2: The Gift & The Curse (2002). Beyonce appeared as Jay Z's girlfriend in the music video for the song, which would further fuel speculation of their relationship. On April 4, 2008, Beyonce and Jay Z were married without publicity. As of April 2014, the couple have sold a combined 300 million records together. The couple are known for their private relationship, although they have appeared to become more relaxed in recent years. Beyonce suffered a miscarriage in 2010 or 2011, describing it as "the saddest thing" she had ever endured. She returned to the studio and wrote music in order to cope with the loss. In April 2011, Beyonce and Jay Z traveled to Paris in order to shoot the album cover for her 4, and unexpectedly became pregnant in Paris.
When were Beyonce and Jay Z married?
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The answer: April 4, 2008

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On 1 January 1967, Yugoslavia was the first communist country to open its borders to all foreign visitors and abolish visa requirements. In the same year Tito became active in promoting a peaceful resolution of the ArabIsraeli conflict. His plan called for Arabs to recognize the state of Israel in exchange for territories Israel gained.
In what year did the first communist country open its borders to all foreign visitors?
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The answer:
1967