Question: The answer to the question: What is the last name of the person whose debut album was Age Ain't Nothing but a Number? is inside the article: Aaliyah Dana Haughton (; January 16, 1979 – August 25, 2001) was an American singer, actress, and model. Born in Brooklyn, New York, and raised in Detroit, Michigan, she first gained recognition at the age of 10, when she appeared on the television show Star Search and performed in concert alongside Gladys Knight. At the age of 12, Aaliyah signed with Jive Records and her uncle Barry Hankerson's Blackground Records. Hankerson introduced her to R. Kelly, who became her mentor, as well as lead songwriter and producer of her debut album, Age Ain't Nothing but a Number. The album sold 3 million copies in the United States and was certified double platinum by the Recording Industry Association of America (RIAA). After facing allegations of an illegal marriage with Kelly, Aaliyah ended her contract with Jive and signed with Atlantic Records. Aaliyah worked with record producers Timbaland and Missy Elliott for her second album, One in a Million, which sold 3 million copies in the United States and more than 8 million copies worldwide. In 2000, Aaliyah appeared in her first film, Romeo Must Die. She contributed to the film's soundtrack, which spawned the single "Try Again". The song topped the Billboard Hot 100 solely on airplay, making Aaliyah the first artist in Billboard history to achieve this goal. "Try Again" also earned Aaliyah a Grammy Award nomination for Best Female R&B Vocalist. After completing Romeo Must Die, Aaliyah filmed her role in Queen of the Damned, and released her self-titled third and final studio album in 2001. On August 25, 2001, Aaliyah and eight others were killed in a plane crash in the Bahamas after filming the music video for the single "Rock the Boat". The pilot, Luis Morales III, was unlicensed at the time of the accident and toxicology tests revealed that he had traces of cocaine and alcohol in his system. Aaliyah's family later filed a wrongful death lawsuit against Blackhawk International Airways, which was settled out of court. Aaliyah's music continued to achieve commercial..., can you guess it ?
Answer: Haughton

Question: The answer to the question: What were the full names of the two people who calculated the critical mass of uranium? is inside the article: 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 Frisch–Peierls memorandum, which was the initial step in the development of the nuclear arms programme in Britain. This..., can you guess it ?
Answer: Rudolf Peierls

Question: The answer to the question: What is the name of the band that toured North America backed by High on Fire, Baroness, and Nachtmystium? is inside the article: Opeth entered Fascination Street Studios in November 2007 to record their ninth studio album, with Åkerfeldt producing. By January 2008, Opeth had recorded 13 songs, including three cover songs. The finished album, Watershed, features seven tracks, with cover songs used as bonus tracks on different versions of the album. Watershed was released on June 3, 2008. Åkerfeldt described the songs on the album as "a bit more energetic". Opeth toured in support of Watershed, including headlining the UK Defenders of the Faith tour with Arch Enemy, an appearance at Wacken Open Air, and the Progressive Nation tour with headliner Dream Theater. Watershed was Opeth's highest-charting album to date, debuting at number 23 on the US Billboard 200, on the Australian ARIA album charts at number seven and at number one on Finland's official album chart. Opeth went on a worldwide tour in support of Watershed. From September to October, the band toured North America backed by High on Fire, Baroness, and Nachtmystium. They returned to tour Europe for the rest of the year with Cynic and The Ocean.In 2010, Opeth wrote and recorded the new track, "The Throat of Winter", which appeared on the digital EP soundtrack of the video game, God of War III. Åkerfeldt described the song as "odd" and "not very metal." To celebrate their 20th anniversary, Opeth performed a six-show, worldwide tour called Evolution XX: An Opeth Anthology, from March 30 through April 9, 2010. Blackwater Park was performed in its entirety, along with several songs never before performed. The concert of April 5, 2010, at the Royal Albert Hall in London, England was filmed for a DVD and live album package titled In Live Concert at the Royal Albert Hall. The set was released on September 21, 2010, in 2-DVD and 2-DVD/3-CD configurations. For the DVD the concert was split into two sets. The first set consists of the entire Blackwater Park album, while the second set contains one song from every album excluding Blackwater Park, in chronological order representing the..., can you guess it ?
Answer: