Question: Given the below context: Zenzile Miriam Makeba (4 March 1932 9 November 2008), nicknamed Mama Africa, was a South African singer, songwriter, actress, United Nations goodwill ambassador, and civil rights activist. Associated with musical genres including Afropop, jazz, and world music, she was an advocate against apartheid and white-minority government in South Africa. Born in Johannesburg to Swazi and Xhosa parents, Makeba was forced to find employment as a child after the death of her father. She had a brief and allegedly abusive first marriage at the age of 17, gave birth to her only child in 1950, and survived breast cancer. Her vocal talent had been recognized when she was a child, and she began singing professionally in the 1950s, with the Cuban Brothers, the Manhattan Brothers, and an all-woman group, the Skylarks, performing a mixture of jazz, traditional African melodies, and Western popular music. In 1959, Makeba had a brief role in the anti-apartheid film Come Back, Africa, which brought her international attention, and led to her performing in Venice, London, and New York City. In London, she met the American singer Harry Belafonte, who became a mentor and colleague. She moved to New York City, where she became immediately popular, and recorded her first solo album in 1960. Her attempt to return to South Africa that year for her mother's funeral was prevented by the country's government. Makeba's career flourished in the United States, and she released several albums and songs, her most popular being "Pata Pata" (1967). Along with Belafonte she received a Grammy Award for her 1965 album An Evening with Belafonte/Makeba. She testified against the South African government at the United Nations and became involved in the civil rights movement. She married Stokely Carmichael, a leader of the Black Panther Party, in 1968. As a result, she lost support among white Americans and faced hostility from the US government, leading her and Carmichael to move to Guinea. She continued to perform, mostly in African countries, including... Guess a valid title for it!
Answer: Miriam Makeba

Question: Given the below context: As Opeth's primary songwriter and lyricist, vocalist/guitarist Mikael Akerfeldt heads the direction of Opeth's sound. He was influenced at a young age by the 1970s progressive rock bands King Crimson, Yes, Genesis, Camel, P.F.M., Hawkwind, and Gracious, and by heavy metal bands such as Iron Maiden, Slayer, Death, Black Sabbath, Deep Purple, Celtic Frost, King Diamond, Morbid Angel, Voivod, and, most importantly, Judas Priest. Akerfeldt considers Judas Priest's Sad Wings of Destiny (1976) the best metal album of all time, and notes that there was a time when he listened only to Judas Priest. While warming up before Opeth concerts, Akerfeldt frequently sings "Here Come the Tears" from Judas Priest's third album Sin After Sin (1977). Akerfeldt later discovered progressive rock and folk music, both of which had a profound impact on the sound of the band.Opeth's distinct sound mixes death metal with progressive rock. Steve Huey of AllMusic refers to Opeth's "epic, progressive death metal style". Ryan Ogle of Blabbermouth described Opeth's sound as incorporating "the likes of folk, funk, blues, '70s rock, goth and a laundry list of other sonic oddities into their trademark progressive death style." In his review of Opeth's 2001 album Blackwater Park, AllMusic's Eduardo Rivadavia wrote, "Tracks start and finish in seemingly arbitrary fashion, usually traversing ample musical terrain, including acoustic guitar and solo piano passages, ambient soundscapes, stoner rock grooves, and Eastern-tinged melodiesany of which are subject to savage punctuations of death metal fury at any given moment." Akerfeldt commented on the diversity of Opeth's music: I don't see the point of playing in a band and going just one way when you can do everything. It would be impossible for us to play just death metal; that is our roots, but we are now a mishmash of everything, and not purists to any form of music. It's impossible for us to do that, and quite frankly I would think of it as boring to be in a band that plays just metal music.... Guess a valid title for it!
Answer: Opeth

Question: Given the below context: At Birmingham, Oliphant's team had reached a different conclusion. Oliphant had delegated the task to two German refugee scientists, Rudolf Peierls and Otto Frisch, who could not work on Oliphant's radar project because they were enemy aliens and therefore lacked the necessary security clearance. Francis Perrin had calculated the critical mass of uranium to be about 40 tonnes (39 long tons; 44 short tons). He reckoned that if a neutron reflector were placed around it, this might be reduced to 12 tonnes (12 long tons; 13 short tons). Peierls attempted to simplify the problem by using the fast neutrons produced by fission, thus omitting consideration of moderator. He too calculated the critical mass of a sphere of uranium in a theoretical paper written in 1939 to be "of the order of tons".Peierls knew the importance of the size of the critical mass that would allow a chain reaction to take place and its practical significance. In the interior of a critical mass sphere, neutrons are spontaneously produced by the fissionable material. A very small portion of these neutrons are colliding with other nuclei, while a larger portion of the neutrons are escaping through the surface of the sphere. Peierls calculated the equilibrium of the system, where the number of neutrons being produced equalled the number escaping.Niels Bohr had theorised that the rare uranium-235 isotope, which makes up only about 0.7% of natural uranium, was primarily responsible for fission with fast neutrons, although this was not yet universally accepted. Frisch and Peierls were thus able to revise their initial estimate of critical mass needed for nuclear fission in uranium to be substantially less than previously assumed. They estimated a metallic sphere of uranium-235 with a radius of 2.1 centimetres (0.83 in) could suffice. This amount represented approximately 1 kilogram (2.2 lb) of uranium-235. These results led to the FrischPeierls memorandum, which was the initial step in the development of the nuclear arms programme in Britain. This... Guess a valid title for it!
Answer:
Tube Alloys