Article: The British adopted "effective ceiling", meaning the altitude at which a gun could deliver a series of shells against a moving target; this could be constrained by maximum fuse running time as well as the gun's capability. By the late 1930s the British definition was "that height at which a directly approaching target at 400 mph (=643.6 km/h) can be engaged for 20 seconds before the gun reaches 70 degrees elevation". However, effective ceiling for heavy AA guns was affected by non-ballistic factors:

Question: Who adopted the use of the term, effective ceiling?
Ans: The British

Article: During her childhood, Madonna was inspired by actors, later saying, "I loved Carole Lombard and Judy Holliday and Marilyn Monroe. They were all incredibly funny ... and I saw myself in them ... my girlishness, my knowingness and my innocence." Her "Material Girl" music video recreated Monroe's look in the song "Diamonds Are a Girl's Best Friend", from the film Gentlemen Prefer Blondes (1953). She studied the screwball comedies of the 1930s, particularly those of Lombard, in preparation for the film Who's That Girl. The video for "Express Yourself" (1989) was inspired by Fritz Lang's silent film Metropolis (1927). The video for "Vogue" recreated the style of Hollywood glamour photographs, in particular those by Horst P. Horst, and imitated the poses of Marlene Dietrich, Carole Lombard, and Rita Hayworth, while the lyrics referred to many of the stars who had inspired her, including Bette Davis, described by Madonna as an idol. However, Madonna's film career has been largely received negatively by the film critic community. Stephanie Zacharek, critic for Time magazine, stated that, "[Madonna] seems wooden and unnatural as an actress, and it's tough to watch, because she's clearly trying her damnedest." According to biographer Andrew Morton, "Madonna puts a brave face on the criticism, but privately she is deeply hurt." After the box office bomb Swept Away (2002), Madonna vowed that she would never again act in a film, hoping her repertoire as a bad actress would never be discussed again.

Question: The video Express Yourself was inspired by which silent film?
Ans: Metropolis

Article: Nigeria was the only country in Africa to have never eradicated polio, which it periodically exported to other African countries; Polio was cut 98% between 2009 and 2010. However, a major breakthrough came in December 2014, when it was reported that Nigeria hadn't recorded a polio case in 6 months, and on its way to be declared Polio free. In 2012, a new bone marrow donor program was launched by the University of Nigeria to help people with leukaemia, lymphoma, or sickle cell disease to find a compatible donor for a life-saving bone marrow transplant, which cures them of their conditions. Nigeria became the second African country to have successfully carried out this surgery. In the 2014 ebola outbreak, Nigeria was the first country to effectively contain and eliminate the Ebola threat that was ravaging three other countries in the West African region, the Nigerian unique method of contact tracing employed by Nigeria became an effective method later used by countries, such as the united States, when ebola threats were discovered.

Question: What was the last African country to still have significant Polio problems?
Ans: Nigeria

Article: Frederick the Great, the king of Prussia from 1740 to 1786, saw himself as a leader of the Enlightenment and patronized philosophers and scientists at his court in Berlin. Voltaire, who had been imprisoned and maltreated by the French government, was eager to accept Frederick's invitation to live at his palace. Frederick explained, "My principal occupation is to combat ignorance and prejudice ... to enlighten minds, cultivate morality, and to make people as happy as it suits human nature, and as the means at my disposal permit."

Question: Who was the king of Prussia from 1740 to 1786?
Ans:
Frederick the Great,