IN: 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.

What day did the vaccine get used?

OUT: In 1954 he tested the vaccine on about one million children, known as the polio pioneers.

Answer the question at the end by quoting:

Bhatt was born on 15 March 1993 in Mumbai to Indian film director Mahesh Bhatt and actress Soni Razdan. Her father is of Gujarati descent and her mother is of Kashmiri and German ancestry. Director Nanabhai Bhatt is her paternal grandfather. She has an elder sister, Shaheen (born 1988) and two half-siblings, Pooja Bhatt and Rahul Bhatt.
Bhatt has performed playback singing for the song "Sooha Saaha" in Highway (2014). A. R. Rahman, the composer of the film, invited her to his music school to undergo training. In 2014, she sang the unplugged version of the song "Samjhawan", for the composers Sharib-Toshi, in Humpty Sharma Ki Dulhania. In 2016, she sang an alternate version of the song "Ikk Kudi", for the soundtrack of Udta Punjab, with her co-star Dosanjh.  In addition to acting in films, Bhatt has performed at the Filmfare, Screen and Stardust award ceremonies, and has also participated in a stage show in Hong Kong alongside Varun Dhawan and Sidharth Malhotra. In 2013, she performed at a charity event with Dhawan, Malhotra, Aditya Roy Kapur, Shraddha Kapoor and Huma Qureshi to raise funds for the flood-affected victims of Uttarakhand. In August 2016, she performed in various cities of the United States as a part of the "Dream Team 2016" tour, alongside actors Dhawan, Malhotra, Kapur, Katrina Kaif, Parineeti Chopra, filmmaker Karan Johar, and singer Badshah.  In 2013, Bhatt took part in a campaign for PETA to raise awareness about homeless animals. In 2017, Bhatt launched an ecological initiative named CoExist to raise awareness about the welfare of street animals. The following year, she collaborated with Facebook Live for a campaign named Find Your Green, to campaign for environmentalism.  In 2014, Bhatt launched her own line of clothing for women in association with the online fashion portal Jabong.com; she described the collection to be "very simple" and "very me". She is also the celebrity endorser for a number of brands and products, including Coca-Cola, Garnier and Maybelline.

IS this something she is passionate about?

The following year, she collaborated with Facebook Live for a campaign named Find Your Green,

input: Levine made his Metropolitan Opera (the "Met") debut at age 28 on June 5, 1971, leading a June Festival performance of Tosca. Following further appearances with the company, he was named principal conductor of the Metropolitan Opera in February 1972. He became the Met's principal conductor in 1973, and its Music Director in 1975. In 1983, he served as conductor and musical director for the Franco Zeffirelli screen adaptation of La Traviata, which featured the Met orchestra and chorus members. He became the company's first artistic director in 1986, and relinquished the title in 2004. In 2005, Levine's combined salary from the Boston Symphony Orchestra and the Met made him the highest-paid conductor in the country, at $3.5 million.  During Levine's tenure, the Metropolitan Opera orchestra expanded its activities into the realms of recording, and separate concert series for the orchestra and chamber ensembles from The Met Orchestra at Carnegie Hall. Levine led the Metropolitan Opera on many domestic and international tours. For the 25th anniversary of his Met debut, Levine conducted the world premiere of John Harbison's The Great Gatsby, commissioned especially to mark the occasion. On his appointment as general manager of the Met, Peter Gelb emphasized that Levine was welcome to remain as long as he wanted to direct music there. Levine was paid $2.1 million by the Met in 2010.  Following a series of injuries that began with a fall (see below), Levine's subsequent health problems led to his withdrawal from many Metropolitan Opera conducting engagements. Following a May 2011 performance of Die Walkure, Levine formally withdrew from all conducting engagements at the Met. After two years of physical therapy, Levine returned to conducting with a May 2013 concert with the Metropolitan Opera Orchestra at Carnegie Hall. On September 25, 2013, Levine conducted his first Met performance since May 2011, in a revival production of Cosi fan tutte. Levine was scheduled to conduct three productions at the opera house and three concerts at Carnegie Hall in the 2013-14 season. On April 14, 2016, Met management announced that Levine would step down from his position as Music Director at the end of the 2015-16 season. Levine was paid $1.8 million by the Met for the 2015/16 season. He assumed the new title of Music Director Emeritus, which he held until December 2017, when in the wake of allegations that Levine had sexually abused four young men, the Met suspended its relationship with him and cancelled all his future scheduled performances with the company.

Answer this question "what was he doing in the opera?"
output:
leading a June Festival performance of Tosca.