Problem: Background: Eratosthenes of Cyrene (; Greek: Eratosthenes o Kurenaios, IPA:
Context: Eratosthenes was described by the Suda Lexicon as a Pentathlos (Pentathlos) which can be translated as "All-Rounder", for he was skilled in a variety of things: He was a true polymath. He was nicknamed Beta because he was great at many things and tried to get his hands on every bit of information but never achieved the highest rank in anything; Strabo accounts Eratosthenes as a mathematician among geographers and a geographer among mathematicians.  Eusebius of Caesarea in his Preparatio Evangelica includes a brief chapter of three sentences on celestial distances (Book XV, Chapter 53). He states simply that Eratosthenes found the distance to the Sun to be "stadion muriadas tetrakosias kai oktokismurias" (literally "of stadia myriads 400 and 80,000") and the distance to the Moon to be 780,000 stadia. The expression for the distance to the Sun has been translated either as 4,080,000 stadia (1903 translation by E. H. Gifford), or as 804,000,000 stadia (edition of Edouard des Places, dated 1974-1991). The meaning depends on whether Eusebius meant 400 myriad plus 80,000 or "400 and 80,000" myriad. With a stade of 185 m, 804,000,000 stadia is 149,000,000 km, approximately the distance from the Earth to the Sun.  Eratosthenes also calculated the Sun's diameter. According to Macrobious, Eratosthenes made the diameter of the Sun to be about 27 times that of the Earth. The actual figure is approximately 109 times.  During his time at the Library of Alexandria, Eratosthenes devised a calendar using his predictions about the ecliptic of the Earth. He calculated that there are 365 days in a year and that every fourth year there would be 366 days.  He was also very proud of his solution for Doubling the Cube. His motivation was that he wanted to produce catapults. Eratosthenes constructed a mechanical line drawing device to calculate the cube, called the mesolabio. He dedicated his solution to King Ptolemy, presenting a model in bronze with it a letter and an epigram. Archimedes was Eratosthenes' friend and he, too, worked on the war instrument with mathematics. Archimedes dedicated his book The Method to Eratosthenes, knowing his love for learning and mathematics.
Question: Does the article mention where he lived?
Answer: Eusebius of Caesarea

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: Robinson was successful despite the obstacle of racism. A favorite Robinson anecdote is that he seated himself in a restaurant and a customer objected to his presence. When the manager suggested that it might be better if Robinson leave, he smiled and asked, "Have you got a ten-dollar bill?" Politely asking to borrow the manager's note for a moment, Robinson added six $10 bills from his own wallet and mixed them up, then extended the seven bills together, adding, "Here, let's see you pick out the colored one". The restaurant manager served Robinson without further delay.  Despite earning and spending a fortune, his memories of surviving the streets as a child never left him, prompting many acts of generosity. In 1933, while in his hometown of Richmond, he saw two children caught between the heat of traffic to retrieve their ball. There was no stoplight at the intersection: Robinson went to the city and provided the money to have one installed. In 1973, a statue of "Bojangles", sculpted by Jack Witt, at the intersection of Adams and West Leigh Streets was established in a small park at the intersection.  Robinson co-founded the New York Black Yankees baseball team in Harlem in 1936 with financier James "Soldier Boy" Semler. The team was a successful member of the Negro National League until it disbanded in 1948, after Major League Baseball was desegregated.  In 1989, a joint U.S. Senate/House resolution declared "National Tap Dance Day" to be May 25, the anniversary of Bill Robinson's birth.  Robinson was inducted into the National Museum of Dance's Mr. & Mrs. Cornelius Vanderbilt Whitney Hall of Fame in 1987.
Question: what did he do ?
Answer:
When the manager suggested that it might be better if Robinson leave, he smiled and asked, "Have you got a ten-dollar bill?"