Problem: Background: Bill "Bojangles" Robinson (May 25, 1878 - November 25, 1949) was an American tap dancer and actor, the best known and most highly paid African-American entertainer in the first half of the twentieth century. His long career mirrored changes in American entertainment tastes and technology. He started in the age of minstrel shows and moved to vaudeville, Broadway, the recording industry, Hollywood, radio, and television.
Context: In 1928, a white impresario, Lew Leslie, produced Blackbirds of 1928 on Broadway, a black revue for white audiences starring Adelaide Hall and Bill Robinson along with Aida Ward, Tim Moore and other black stars. The show was a huge success on Broadway, where it ran for over one year to sell-out performances. On stage, Adelaide Hall and Robinson danced and sang a duet together, which captivated the audiences. From then on, Robinson's public role was that of a dapper, smiling, plaid-suited ambassador to the white world, maintaining a connection with the black show-business circles through his continuing patronage of the Hoofers Club, an entertainer's haven in Harlem. So successful was Adelaide Hall's collaboration with Bojangles, they even appeared together on stage at the prestigious Palace Theatre (Broadway) before they were teamed up together again by Marty Forkins (Robinson's manager) to star in another Broadway musical titled, "Brown Buddies", that opened in 1930 at the Liberty Theatre, where it ran for four months before commencing a road tour of the States.  In 1939, Robinson returned to the stage in The Hot Mikado, a jazz version of the Gilbert and Sullivan operetta. The show opened at the Broadhurst Theatre, with Robinson cast in the role of the Emperor. His rendition of My Object All Sublime stopped the show and produced eight encores. After Broadway, the show moved to the 1939 New York World's Fair, and was one of the greatest hits of the fair. August 25, 1939, was named Bill Robinson Day at the fair.  Robinson's next Broadway show, All in Fun (1940), was with an all-white cast. Despite having Imogene Coca, Pert Kelton, and other stars, the show received poor reviews at out-of-town tryouts in New Haven and Boston. When the white stars and co-producers, Phil Baker and Leonard Sillman, withdrew, Robinson became the star, the first time an African-American headlined an otherwise all-white production. Although the reviewers were enthusiastic about Robinson, they panned the show, and it failed to attract audiences. All in Fun closed after four performances.
Question: Was he allowed to perform solo during this production?
Answer: Although the reviewers were enthusiastic about Robinson, they panned the show, and it failed to attract audiences. All in Fun closed after four performances.

Problem: Background: Chris Austin Hadfield  (born 29 August 1959) is a retired Canadian astronaut who was the first Canadian to walk in space. An engineer and former Royal Canadian Air Force fighter pilot, Hadfield has flown two space shuttle missions and served as commander of the International Space Station. Hadfield, who was raised on a farm in southern Ontario, was inspired as a child when he watched the Apollo 11 Moon landing on TV. He attended high school in Oakville and Milton and earned his glider pilot licence as a member of the Royal Canadian Air Cadets.
Context: Hadfield attended White Oaks Secondary School in Oakville, Ontario until his senior year and then graduated as an Ontario Scholar from Milton District High School in 1977. As a member of the Royal Canadian Air Cadets, he earned a glider pilot scholarship at age 15 and a powered pilot scholarship at age 16. After graduating from high school in 1978, he joined the Canadian Armed Forces and spent two years at Royal Roads Military College followed by two years at the Royal Military College, where he received a bachelor's degree in mechanical engineering in 1982. Before graduating, he also underwent basic flight training at CFB Portage la Prairie. In 1983, he took honours as the top graduate from Basic Jet Training at CFB Moose Jaw, and then went on to train as a tactical fighter pilot with 410 Tactical Fighter Operational Training Squadron at CFB Cold Lake, flying the Canadair CF-116 Freedom Fighter and the McDonnell Douglas CF-18 Hornet. After completing his fighter training, Hadfield flew CF-18 Hornets with 425 Tactical Fighter Squadron, flying intercept missions for NORAD. He was the first CF-18 pilot to intercept a Soviet Tupolev Tu 95 long-range bomber in the Canadian Arctic.  In the late 1980s, Hadfield attended the US Air Force Test Pilot School at Edwards Air Force Base and served as an exchange officer with the US Navy at Strike Test Directorate at the Patuxent River Naval Air Station. His accomplishments from 1989 to 1992 included testing the McDonnell Douglas F/A-18 Hornet and LTV A-7 Corsair II aircraft; performing research work with NASA on pitch control margin simulation and flight; completing the first military flight of F/A-18 enhanced performance engines; piloting the first flight test of the National Aerospace Plane external burning hydrogen propulsion engine; developing a new handling qualities rating scale for high angle-of-attack test; and participating in the F/A-18 out-of-control recovery test program.  In May 1992, Hadfield graduated with a master's degree in aviation systems from the University of Tennessee Space Institute, where his thesis concerned high-angle attack aerodynamics of the F/A-18 Hornet fighter jet. In total, Hadfield has flown over 70 different types of aircraft.
Question: Are there any other interesting aspects about this article?
Answer: After completing his fighter training, Hadfield flew CF-18 Hornets with 425 Tactical Fighter Squadron,

Problem: Background: Moss was born in London, son of Alfred Moss, a dentist of Bray, Berkshire, and Aileen (nee Craufurd). He was brought up at Long White Cloud house on the right bank of the River Thames. His father was an amateur racing driver who had placed 16th at the 1924 Indianapolis 500. Stirling was a gifted horse rider as was his younger sister, Pat Moss, who became a successful rally driver and married Erik Carlsson.
Context: Although ostensibly retired from racing since 1962, Moss did make a number of one-off appearances in professional motorsport events in the following two decades. He also competed in the 1974 London-Sahara-Munich World Cup Rally in a Mercedes-Benz, but retired from the event in the Algerian Sahara. The Holden Torana he shared with Jack Brabham in the 1976 Bathurst 1000 was hit from behind on the grid and eventually retired with engine failure. Moss, at the wheel of the Torana when the V8 engine let go, was criticised by other drivers for staying on the racing line for over  2/3  of the 6.172 km long circuit while returning to the pits as the car was dropping large amounts of oil onto the road. He also shared a Volkswagen Golf GTI with Denny Hulme in the 1979 Benson & Hedges 500 at Pukekohe Park Raceway in New Zealand.  In 1980 he made a comeback to regular competition, in the British Saloon Car Championship with the works-backed GTi Engineering Audi team. For the 1980 season Moss was the team's number two driver to team co-owner Richard Lloyd. For the 1981 season Moss stayed with Audi, as the team moved to Tom Walkinshaw Racing management, driving alongside Martin Brundle.  Throughout his retirement he raced in events for historic cars, driving on behalf of and at the invitation of others, as well as campaigning his own OSCA FS 372 and other vehicles.  On 9 June 2011 during qualifying for the Le Mans Legends race, Moss announced on Radio Le Mans that he had finally retired from racing, saying that he had scared himself that afternoon. He was 81.
Question: why did he return to racing?
Answer:
In 1980 he made a comeback to regular competition,