Title: James Chadwick
Content:  James Chadwick was born in Bollington, Cheshire, on 20 October 1891, the first child of John Joseph Chadwick, a cotton spinner, and Anne Mary Knowles, a domestic servant. He was named James after his paternal grandfather. In 1895, his parents moved to Manchester, leaving him in the care of his maternal grandparents. He went to Bollington Cross Primary School, and was offered a scholarship to Manchester Grammar School, which his family had to turn down as they could not afford the small fees that still had to be paid. Instead he attended the Central Grammar School for Boys in Manchester, rejoining his 
Title: James Chadwick
Content:  Sir James Chadwick, (20 October 1891 – 24 July 1974) was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932. In 1941, he wrote the final draft of the MAUD Report, which inspired the U.S. government to begin serious atomic bomb research efforts. He was the head of the British team that worked on the Manhattan Project during World War II. He was knighted in Britain in 1945 for his achievements in physics. Chadwick graduated from the Victoria University of Manchester in 1911, where he studied under Ernest Rutherford (known as the "father of nuclear physics"). At Manchester, he continued to study under Rutherford until he was awarded his 
Title: James Chadwick
Content:  experiments using improvised materials such as radioactive toothpaste. With the help of Charles Drummond Ellis, he worked on the ionisation of phosphorus, and the photochemical reaction of carbon monoxide and chlorine. He was released after the Armistice with Germany came into effect in November 1918, and returned to his parents' home in Manchester, where he wrote up his findings over the previous four years for the 1851 Exhibition commissioners. Rutherford gave Chadwick a part-time teaching position at Manchester, allowing him to continue research. He looked at the nuclear charge of platinum, silver, and copper, and experimentally found that this was the 
Title: James Chadwick
Content:  in wartime Britain. The enormous structure could never have been concealed from the Luftwaffe. In early 1944, he moved to Los Alamos, New Mexico, with his wife and their twins, who now spoke with Canadian accents. For security reasons, he was given the cover name of James Chaffee. Chadwick accepted that the Americans did not need British help, but that it could still be useful in bringing the project to an early and successful conclusion. Working closely with the director of the Manhattan Project, Major General Leslie R. Groves, Jr., he attempted to do everything he could to support the effort. He also endeavoured to place 
Title: Edwin Chadwick
Content:  Sir Edwin Chadwick KCB (24 January 1800 – 6 July 1890) was an English social reformer who is noted for his leadership in reforming the Poor Laws in England and instituting major reforms in urban sanitation and public health. A disciple of Utilitarian philosopher Jeremy Bentham, he was most active between 1832 and 1854; after that he held minor positions, and his views were largely ignored. Chadwick pioneered the use of scientific surveys to identify all phases of a complex social problem, and pioneered the use of systematic long-term inspection programmes to make sure the reforms operated as planned.
Title: Henry Chadwick (writer)
Content:  Chadwick was born on October 5, 1824 in Exeter, England. His grandfather, Andrew Chadwick, had been a close friend of theologian John Wesley. His father, James Chadwick, was a supporter of the French Revolution who also tutored John Dalton in music and botany. James Chadwick had served as editor of a publication known as the Western Times. Edwin Chadwick's mother had made James Chadwick a widower shortly after Edwin's birth. Chadwick was the younger half-brother of Sir Edwin Chadwick, England's sanitary philosopher who developed environmental measures and laws designed to counteract the effects of the Industrial Revolution. Chadwick moved to Brooklyn with 
Title: James Chadwick
Content:  Americans disliked Akers, so Chadwick was appointed technical advisor to the Combined Policy Committee, and the head of the British Mission. Leaving Rotblat in charge in Liverpool, Chadwick began a tour of the Manhattan Project facilities in November 1943, except for the Hanford Site where plutonium was produced, which he was not allowed to see. He became the only man apart from Groves and his second in command to have access to all the American research and production facilities for the uranium bomb. Observing the work on the K-25 gaseous diffusion facility at Oak Ridge, Tennessee, Chadwick realised how wrong he had been about building the 
Title: Roy Chadwick
Content:  unbounded enthusiasm and unsparing energy, Roy Chadwick was a great designer of intuitive diagnostic ability rather than a scientist, yet like all great masters was in step with the tide of knowledge and contemporary outlook." Chadwick was appointed a Commander of the Order of the British Empire in the 1943 Birthday Honours for his contribution to the design of the Lancaster and in particular for the adaptations he made to it in preparation for the low-level attacks on the German dams, during the Dam Busters raid Operation Chastise. The same year he was granted the Honorary Freedom of the City of London.
Title: James Chadwick
Content:  le Mérite from Germany. He was elected a Fellow of the Royal Society in 1927, and in 1946 he became foreign member of the Royal Netherlands Academy of Arts and Sciences. He was made a Companion of Honour in the New Year Honours on 1 January 1970 for "services to science", and went to Buckingham Palace for the investiture ceremony. He became more frail, and seldom left his flat, although he travelled to Liverpool for celebrations of his eightieth birthday. A lifelong atheist, he saw no reason to adopt religious faith in later life. He died in his sleep on 24 July 1974. His papers are held at the 
Title: James Chadwick
Content:  bomb, while his Manchester lab and environs were harassed by Luftwaffe bombing. When the Quebec Agreement merged his project with the American Manhattan Project, he became part of the British Mission, and worked at the Los Alamos Laboratory and in Washington, D.C. He surprised everyone by earning the almost-complete trust of project director Leslie R. Groves, Jr. For his efforts, Chadwick received a knighthood in the New Year Honours on 1 January 1945. In July 1945, he viewed the Trinity nuclear test. After this, he served as the British scientific advisor to the United Nations Atomic Energy Commission. Uncomfortable with the trend toward Big Science, Chadwick became the Master of Gonville and Caius College in 1948. He retired in 1959.

Question: what did james chadwick invent?
Answer: Neutron.