Some context: Jonas Edward Salk (; October 28, 1914 - June 23, 1995) was an American medical researcher and virologist. He discovered and developed one of the first successful polio vaccines. Born in New York City, he attended New York University School of Medicine, later choosing to do medical research instead of becoming a practicing physician. In 1939, after earning his medical degree, Salk began an internship as a physician scientist at Mount Sinai Hospital.
In 1947, Salk became ambitious for his own lab and was granted one at the University of Pittsburgh, but the lab was smaller than he had hoped and he found the rules imposed by the university restrictive. In 1948, Harry Weaver, the director of research at the National Foundation for Infantile Paralysis, contacted Salk. He asked Salk to find out if there were more types of polio than the three then known, offering additional space, equipment and researchers. For the first year he gathered supplies and researchers including Julius Youngner, Byron Bennett, L. James Lewis, and secretary Lorraine Friedman joined Salk's team, as well. As time went on, Salk began securing grants from the Mellon family and was able to build a working virology laboratory. He later joined the National Foundation for Infantile Paralysis's polio project established by President Franklin D. Roosevelt. Extensive publicity and fear of polio led to much increased funding, $67 million by 1955, but research continued on dangerous live vaccines. Salk decided to use the safer 'killed' virus, instead of weakened forms of strains of polio viruses like the ones used contemporarily by Albert Sabin, who was developing an oral vaccine. After successful tests on laboratory animals, on July 2, 1952, assisted by the staff at the D.T. Watson Home for Crippled Children, Salk injected 43 children with his killed-virus vaccine. A few weeks later, Salk injected children at the Polk State School for the retarded and feeble-minded. In 1954 he tested the vaccine on about one million children, known as the polio pioneers. The vaccine was announced as safe on April 12, 1955. The project became large, involving 100 million contributors to the March of Dimes, and 7 million volunteers. The foundation allowed itself to go into debt to finance the final research required to develop the Salk vaccine. Salk worked incessantly for two and a half years. Salk's inactivated polio vaccine was the first vaccine for the disease; it came into use in 1955. It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system.
How long did it take Salk to finish his polio vaccine?
A: Salk worked incessantly for two and a half years.

Some context: Captain Marvel, also known as Shazam (), is a fictional superhero appearing in American comic books published by DC Comics. Artist C. C. Beck and writer Bill Parker created the character in 1939. Captain Marvel first appeared in Whiz Comics #2 (cover-dated Feb. 1940), published by Fawcett Comics.
The first post-Crisis appearance of Captain Marvel was in the 1986 Legends miniseries. In 1987, Captain Marvel appeared as a member of the Justice League in Keith Giffen's and J. M. DeMatteis' relaunch of that title. That same year (spinning off from Legends), he was given his own miniseries titled Shazam!: The New Beginning. With this four-issue miniseries, writers Roy and Dann Thomas and artist Tom Mandrake attempted to re-launch the Captain Marvel mythos and bring the wizard Shazam, Dr. Sivana, Uncle Dudley, and Black Adam into the modern DC Universe with an altered origin story. Roy Thomas, a veteran comic book writer and editor, had been lured from Marvel Comics to DC in 1981 with the specific contractual obligation that he would become the main writer of Shazam! and the Justice Society of America characters. Before the Crisis, Thomas wrote several of the DC Comics Presents stories featuring the Marvel Family. The most notable change that the Thomases, Giffen, and DeMatteis introduced into the Captain Marvel mythos was that the personality of young Billy Batson is retained when he transforms into the Captain. This change would remain for most future uses of the character as justification for his sunny, Golden-Age personality in the darker modern-day comic book world, instead of the traditional depiction used prior to 1986, which tended to treat Captain Marvel and Billy as two separate personalities. This revised version of Captain Marvel also appeared in one story-arc featured in the short-lived anthology Action Comics Weekly #623-626 (October 25, 1988 - November 15, 1988), in which a Neo-Nazi version of Captain Mazi was introduced. At the end of the arc, it was announced that this would lead to a new Shazam! ongoing series. Though New Beginning had sold well and multiple artists were assigned to and worked on the book, it never saw publication due to editorial disputes between DC Comics and Roy Thomas. As a result, Thomas' intended revival of the Marvel Family with a new punk-styled Mary Bromfield/Mary Marvel (aka "Spike") who was not Billy's sister, and an African-American take on Freddy Freeman/Captain Marvel Jr., did not see print. Thomas departed DC in 1989, not long after his removal from the Shazam! project. Other attempts at reviving Shazam! were initiated over the next three years, including a reboot project by John Byrne, illustrator of Legends and writer/artist on the Superman reboot miniseries The Man of Steel (1986). None of these versions saw print, though Captain Marvel, the Wizard Shazam, and Black Adam did appear in DC's War of the Gods miniseries in 1991. By this time, DC had finally ceased the fee-per-use licensing agreement with Fawcett Publications and purchased the full rights to Captain Marvel and the other Fawcett Comics characters.
What happen in the 1980s
A:
The first post-Crisis appearance of Captain Marvel was in the 1986 Legends miniseries.