input: Please answer the following: Given the following 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... answer the following question: What marked the beginning of an aggressive approach towards uranium enrichment and the development of an atomic bomb?
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output: the FrischPeierls memorandum

input: Please answer the following: Given the following context: The drama begins with a murder and a screaming witness. The witness to the crime tells the police that she can identify the murderer and will never forget his face. Mob attorney Walter Colby is called by crime boss Hap Richie in the middle of the night to arrange the release of Caesar, one of his mobsters arrested for the murder. After Colby does so he tells his girlfriend, the unscrupulous mob-connected showgirl Flaxy Martin, that he wants to quit the organization and become respectable. Meanwhile, the syndicate arranges for Peggy Farrar to falsely testify on behalf of Caesar. After Caesar is cleared of the charges, however, she changes her mind. Flaxy and Caesar go visit Peggy at her apartment to force her into silence, and Caesar ends up killing her. Due to circumstantial evidence, Flaxy is suspected of murdering Peggy. Not realizing her involvement in the killing, Colby tells the police that he did it, his plan being to defend himself so well that he gets both himself and Flaxy off. Unfortunately, Flaxy and Hap Richie set him up during the trial and Colby is sentenced for Peggy's murder. As Colby awaits transportation to prison, Sam Malko, a friend of Colby and a former client, tells him that Caesar had been getting drunk and bragging that Colby was sentenced for a killing (the murder of Peggy) that he (Caesar) committed. Sam wonders why Flaxy was not helping Colby since she must know the same information. On his way to prison to serve 20 years, Colby escapes and when he gets to the highway he passes out in front of motorist Nora Carson. Nora helps Colby get to the city to find out how he was framed. Colby realizes that Flaxy was not the woman she pretended to be. answer the following question: Who does Sam Malko tell Walter Colby has been bragging about killing Peggy Farrar?
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output: Caesar

input: Please answer the following: Given the following context: Jeff Gerber lives in an average suburban neighborhood with his seemingly liberal housewife Althea, who tolerates her husband's character flaws out of love. Every morning when Jeff wakes up, he spends some time under a tanning machine, hits the speedbag, drinks a health drink, and races the bus to work on foot. Jeff presents himself as happy-go-lucky and quite a joker, but others tend to see him as obnoxious and boorish. Althea, who watches the race riots every night on TV with great interest, chastises Jeff for not having sympathy for the problems of black Americans. One morning, Jeff wakes up to find that his pigment has changed. He tries to fall back asleep, thinking that it is a dream, but to no avail. He tries taking a shower to wash the "black" off him, but finds it does not work, when Althea walks into the bathroom, and screams. He explains to her that the "Negro in the bathroom" is him. At first, Jeff believes this to be the result of spending too much time under the tanning machine. He spends almost the entire day at home, afraid to go out of the house, only going out once to venture into the "colored part of town" in order to find a pharmacy to buy "the stuff they use in order to make themselves look white." His attempts to change his skin color fail. The next day, he is persuaded to get up and go to work. Things start out well at first, until Jeff is accused of robbery while running alongside the bus to work. The policeman assumes that, since he is a black man, he must have stolen something. During his lunch break, he makes an appointment with his doctor who cannot explain Jeff's condition either. After several calls, the doctor suggests that Jeff might be more comfortable with a black doctor. answer the following question: What is the first name of the person who makes an appointment with his doctor?
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output:
Jeff