Background: Alexander Bell was born in Edinburgh, Scotland, on March 3, 1847. The family home was at 16 South Charlotte Street, and has a stone inscription marking it as Alexander Graham Bell's birthplace. He had two brothers: Melville James Bell (1845-70) and Edward Charles Bell (1848-67), both of whom would die of tuberculosis. His father was Professor Alexander Melville Bell, a phonetician, and his mother was Eliza Grace (nee Symonds).
Context: Although Alexander Graham Bell is most often associated with the invention of the telephone, his interests were extremely varied. According to one of his biographers, Charlotte Gray, Bell's work ranged "unfettered across the scientific landscape" and he often went to bed voraciously reading the Encyclopaedia Britannica, scouring it for new areas of interest. The range of Bell's inventive genius is represented only in part by the 18 patents granted in his name alone and the 12 he shared with his collaborators. These included 14 for the telephone and telegraph, four for the photophone, one for the phonograph, five for aerial vehicles, four for "hydroairplanes", and two for selenium cells. Bell's inventions spanned a wide range of interests and included a metal jacket to assist in breathing, the audiometer to detect minor hearing problems, a device to locate icebergs, investigations on how to separate salt from seawater, and work on finding alternative fuels.  Bell worked extensively in medical research and invented techniques for teaching speech to the deaf. During his Volta Laboratory period, Bell and his associates considered impressing a magnetic field on a record as a means of reproducing sound. Although the trio briefly experimented with the concept, they could not develop a workable prototype. They abandoned the idea, never realizing they had glimpsed a basic principle which would one day find its application in the tape recorder, the hard disc and floppy disc drive, and other magnetic media.  Bell's own home used a primitive form of air conditioning, in which fans blew currents of air across great blocks of ice. He also anticipated modern concerns with fuel shortages and industrial pollution. Methane gas, he reasoned, could be produced from the waste of farms and factories. At his Canadian estate in Nova Scotia, he experimented with composting toilets and devices to capture water from the atmosphere. In a magazine interview published shortly before his death, he reflected on the possibility of using solar panels to heat houses.
Question: What were Alexander Graham Bell's later inventions?
Answer: Bell worked extensively in medical research and invented techniques for teaching speech to the deaf.

Background: Allen Toussaint (; January 14, 1938 - November 10, 2015) was an American musician, songwriter, arranger and record producer, who was an influential figure in New Orleans R&B from the 1950s to the end of the century, described as "one of popular music's great backroom figures." Many musicians recorded Toussaint's compositions, including "Java", "Mother-in-Law", "I Like It
Context: The youngest of three children, Toussaint was born in 1938 in New Orleans and grew up in a shotgun house in the Gert Town neighborhood, where his mother, Naomi Neville (whose name he later adopted pseudonymously for some of his works), welcomed and fed all manner of musicians as they practiced and recorded with her son. His father, Clarence, worked on the railway and played trumpet. Allen Toussaint learned piano as a child and took informal music lessons from an elderly neighbor, Ernest Pinn. In his teens he played in a band, the Flamingos, with the guitarist Snooks Eaglin, before dropping out of school. A significant early influence on Toussaint was the syncopated "second-line" piano style of Professor Longhair.  After a lucky break at age 17, in which he stood in for Huey "Piano" Smith at a performance with Earl King's band in Prichard, Alabama, Toussaint was introduced to a group of local musicians led by Dave Bartholomew, who performed regularly at the Dew Drop Inn, a nightclub on Lasalle Street in Uptown New Orleans. His first recording was in 1957 as a stand-in for Fats Domino on Domino's record "I Want You to Know", on which Toussaint played piano and Domino overdubbed his vocals. His first success as a producer also came in 1957 with Lee Allen's "Walking with Mr. Lee". He began performing regularly in Bartholomew's band, and he recorded with Fats Domino, Smiley Lewis, Lee Allen and other leading New Orleans performers.  After being spotted as a sideman by the A&R man Danny Kessler, he initially recorded for RCA Records as Al Tousan. In early 1958 he recorded an album of instrumentals, The Wild Sound of New Orleans, with a band including Alvin "Red" Tyler (baritone sax), either Nat Perrilliat or Lee Allen (tenor sax), either Justin Adams or Roy Montrell (guitar), Frank Fields (bass), and Charles "Hungry" Williams (drums). The recordings included Toussaint and Tyler's composition "Java", which first charted for Floyd Cramer in 1962 and became a number 4 pop hit for Al Hirt (also on RCA) in 1964. Toussaint also recorded and co-wrote songs with Allen Orange in the early 1960s.
Question: what was his career?
Answer: Piano

Background: Nikolai Ivanovich Yezhov, IPA: [njIka'laj jI'zof]; May 1, 1895 - February 4, 1940) was a Soviet secret police official under Joseph Stalin who was head of the NKVD from 1936 to 1938, during the most active period of the Great Purge. Having presided over mass arrests and executions during the Great Purge, Yezhov fell from Stalin's favour and power. He was arrested, confessed to a range of anti-Soviet activity, later claimed he was tortured into making the confessions, and was executed in 1940.
Context: Yezhov was appointed People's Commissar for Water Transport on April 6, 1938. Though he retained his other posts, his role as grand inquisitor and extractor of confessions gradually diminished as Stalin retreated from the worst excesses of the Great Purge.  By saddling him with the extra job, Stalin killed two birds with one stone: Yezhov could correct the water transportation situation with tough Chekist methods, and his transfer to the terra incognita of economic tasks would leave him less time for the NKVD and weaken his position there, thus creating the possibility that in due course he could be removed from the leadership of the punitive apparatus and replaced by fresh people.  Contrary to Stalin's expectations, the vast number of party officials and military officers lost during Yezhov's purges had been only partially made good by replacement with trusted Stalinist functionaries, and he eventually recognized that the disruption was severely affecting the country's ability to coordinate industrial production and defend its borders from the growing threat of Nazi Germany. Yezhov had accomplished Stalin's intended task for the Great Purge: the public liquidation of the last of his Old Bolshevik political rivals and the elimination of any possibility of "disloyal elements" or "fifth columnists" within the Soviet military and government prior to the onset of war with Germany. From Stalin's perspective, Yezhov (like Yagoda) had served his purpose but had seen too much and wielded too much power to be allowed to live. The defection to Japan of the Far Eastern NKVD chief, Genrikh Lyushkov on June 13, 1938, rightly worried Yezhov, who had protected Lyushkov from the purges and feared he would be blamed.
Question: how long was he in power before the fall from power?
Answer:
the possibility that in due course he could be removed from the leadership of the punitive apparatus and replaced by fresh people.