[Q]: 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!
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[A]: Tube Alloys

[Q]: Given the below context: Diana Whitcombe works at her aunt's country inn, but dreams of escaping to London and making her way in society. When chance provides her with the necessary funds, she makes her way to the big city and takes up employment in a hairdressing salon where she befriends French fellow assistant Annette, and moves into the same hostel in which Annette is living. One day Diana spots a kitten in danger on a busy road, and dashes into the traffic to rescue it. Her kind action is witnessed by singer Jerry Dean, who strikes up a conversation and invites her for lunch the next day at the Ritz Hotel. Diana is worried that has nothing suitable to wear to such a rarefied establishment, but is delighted when Annette produces a beautiful dress which she offers to loan to her. Unknown to Diana however, the dress has been stolen by a maid friend of Annette's from her wealthy employer, and passed to Annette for safe-keeping before it is sold to a dealer. Diana and Jerry meet for their Ritz rendezvous. Unfortunately, also present is the Countess Delavell lunching with her theatrical friend Dudley Chalfont, and it is the Countess' stolen dress which Diana is wearing. At the end of the meeting Jerry, explaining that he has to leave to fulfil engagements in Scotland, proposes to Diana and she accepts. Meanwhile, the Countess' maid, aware that she is already under suspicion, steals some valuable jewellery, alerts Annette and the pair take off for France. Guess a valid title for it!
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[A]: To Be a Lady

[Q]: Given the below context: Like all creeks in Lycoming County, Larrys Creek served as an area for settlers to establish homesteads and farms. As logging became a major industry in the mid-19th century, the creek was a source of power for sawmills and other mills. The first sawmill on the creek, in what is now Mifflin Township, was built in 1799. The relatively low flow of water in the creek did not allow rafts of logs to be floated downstream to the river and the lumber boom at Williamsport (as they were on Pine Creek to the west).This and the lack of logging railroads along the creek led to the development of many small sawmills: the Larrys Creek watershed once had 53 sawmills within 22 miles (35 km) of the mouth (as well as other industries of the time). No other stream in the country had so many sawmills in so small a territory. Twelve sawmills were on the Second Fork, six on the First Fork, one each on Canoe Run and Lawshe Run, and the rest were on Larrys Creek itself. Eight were structures rebuilt on the site of previous sawmills, and only four were steam powered (the rest were water powered). The earliest of these sawmills was built in 1796 (near Seeley Run), the last in 1902 (on Lawshe Run), and by 1903 just two mills were still standing and only one of those was operating.Lumbering removed the tree trunks, but left many flammable limbs, branches, and stumps behind. On May 2, 1872, a large forest fire destroyed the villages of Carter and Gould, 6 miles (9.7 km) north of Salladasburg on Larrys Creek in Mifflin Township. There are large tracts of second growth forest and small lumber companies still operate in the watershed today. Guess a valid title for it!
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[A]: Larrys Creek

[Q]: Given the below context: Radiohead are an English rock band formed in Abingdon-on-Thames in 1985. The band consists of Thom Yorke (vocals, guitar, piano, keyboards), brothers Jonny Greenwood (lead guitar, keyboards, other instruments) and Colin Greenwood (bass), Ed O'Brien (guitar, backing vocals) and Philip Selway (drums, percussion). They have worked with producer Nigel Godrich and cover artist Stanley Donwood since 1994. After signing to EMI in 1991, Radiohead released their debut single "Creep" in 1992. It became a worldwide hit after the release of their debut album, Pablo Honey (1993). Their popularity and critical standing rose in the United Kingdom with the release of their second album, The Bends (1995). Radiohead's third album, OK Computer (1997), brought them international fame; noted for its complex production and themes of modern alienation, it is often acclaimed as a landmark record of the 1990s and one of the best albums in popular music. Kid A (2000) and Amnesiac (2001), recorded simultaneously, marked a dramatic change in style, incorporating influences from experimental electronic music, 20th-century classical music, krautrock, and jazz. Kid A divided listeners but was named the best album of the decade by Rolling Stone, Pitchfork and The Times. Hail to the Thief (2003) mixed rock and electronic music with lyrics inspired by the War on Terror, and was Radiohead's final album for EMI. Their subsequent releases have pioneered alternative release platforms such as pay-what-you-want and BitTorrent; Radiohead self-released their seventh album, In Rainbows (2007), as a download for which customers could set their own price, to critical and chart success. Their eighth album, The King of Limbs (2011), an exploration of rhythm, was developed using extensive looping and sampling. A Moon Shaped Pool (2016) prominently featured Jonny Greenwood's orchestral arrangements. Radiohead had sold more than 30 million albums worldwide by 2011. Their work places highly in both listener polls and critics' lists of the best music of the... Guess a valid title for it!
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[A]:
Radiohead