Problem: Catwoman is a fictional character appearing in American comic books published by DC Comics, commonly in association with the superhero Batman. Created by Bill Finger and Bob Kane, the character made her debut as "the Cat" in Batman #1 (June 1940). Catwoman, whose real name is Selina Kyle, has been Batman's most enduring love interest and is known for her complex love-hate relationship with him. As a Gotham City burglar, Catwoman typically wears a tight, one-piece outfit and uses a bullwhip for a weapon.

In June 2016, the DC Rebirth event relaunched DC Comics' entire line of comic book titles, in which Catwoman has a prominent role in the third volume of Batman. In December 2017, DC Comics ended the Rebirth branding, opting to include everything under a larger "DC Universe" banner and naming, and Catwoman continues to be featured in the third volume Batman. The series reveals Selina's origin through a series of flashbacks and letters exchanged between Bruce and Selina. Her parents died when she was young, and she hardly remembers them. She is sent in the Thomas and Martha Wayne Home for the Boys and Girls of Gotham, and even after being placed in various foster, she would escape to return to the orphanage.  Eventually, Selina becomes Catwoman. During one of her heists, she is approached by the Kite Man to aide the Joker in a gang war against the Riddler, which she refuses. She later aides Batman, with whom she already has a romantic relationship, to spy on the Joker. She is shot from a window, but is unharmed. At some point in the future, her childhood orphanage is bombed by a terrorist group called the Dogs of War. Batman reluctantly arrests Catwoman after all 237 of them are killed, despite Catwoman's insistence on her guilt.  Her first appearance is in Batman #9, where she is revealed to be imprisoned in Arkham Asylum for the alleged murders of the Dogs of War. Batman is determined to prove her innocence, and makes a deal with Amanda Waller to get her off death row in exchange for her help on a mission to Santa Prisca. The mission to find Psycho Pirate is a success, and Batman and Catwoman return to Gotham City. Before Batman can return her to custody, she escapes. Batman investigates the murders of the terrorists that she has been charged with, and deduces that it was in fact Holly Robinson who committed the murders after the terrorists burned down the orphanage she and Selina were raised in. After being attacked by Holly Robinson, Batman is rescued by Catwoman.  Bruce proposes to Selina in Batman #24. In issue #32, Selina asks Bruce to propose to her again, to which she says, "Yes."  The two leave Gotham for Khadym, where Holly Robinson has fled to, to clear Selina's name.  Batman Annual vol. 3, #2 (January 2018) centers on a romantic storyline between Batman and Catwoman. Towards the end, the story is flash-forwarded to the future, in which Bruce Wayne and Selina Kyle are a married couple in their golden years. Bruce receives a terminal medical diagnosis, and Selina cares for him until his death.

What did she do with Dc universe?

Answer with quotes: In June 2016, the DC Rebirth event relaunched DC Comics' entire line of comic book titles, in which Catwoman has a prominent role in the third volume of Batman.


Problem: 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.

Was the vaccine used?

Answer with quotes:
Salk injected children at the Polk State School for the retarded and feeble-minded.