input: Van Halen's next lead singer was Gary Cherone, frontman of the then-defunct Boston-based band Extreme, a group which had enjoyed some popular success in the early 1990s. The result was the album Van Halen III. Many songs were longer and more experimental than Van Halen's earlier work. It was a notable contrast from their previous material, with more focus on ballads than traditional rock songs ("How Many Say I," with Eddie on vocals). Sales were poor by the band's standards, only reaching Gold certification, despite the album peaking at No. 4 on the U.S. charts. However, Van Halen III did produce the hit "Without You," and another album track, "Fire in the Hole," appeared on the Lethal Weapon 4 soundtrack. The album was followed by a tour. The III Tour saw Van Halen playing in new countries, including first ever visits to Australia and New Zealand. Shortly afterwards, Van Halen returned to the studio and in early 1999, they started work on a new album. Working titles of songs included "Left for Dead," "River Wide," "Say Uncle," "You Wear it Well," "More Than Yesterday," "I Don't Miss You ... Much," "Love Divine," and "From Here, Where Do We Go?". The project was left unfinished when Cherone left the band amicably in November 1999. Citing musical differences, it is likely III's poor sales and critical reception had a big impact. None of the material from these sessions has ever been released, and in fact the band released no new material at all until three new songs were included on the 2004 Best of Both Worlds compilation. Lyrics that Cherone had written for the Van Halen III follow up would be used in his next project with Tribe of Judah. Touring with Cherone had proven disappointing in terms of attendance. Eddie would later admit that "the powers that be" (Warner Bros.) had forced his hand in parting with Cherone. Unlike with the previous two singers, there was reportedly no bad blood behind the breakup, and Cherone remained in contact and on good terms with Van Halen. As when Hagar left, speculation resumed on a Roth reunion.

Answer this question "Are there any other interesting aspects about this article?"
output: Van Halen returned to the studio and in early 1999,

input: 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.

Answer this question "What day did the vaccine get used?"
output: In 1954 he tested the vaccine on about one million children, known as the polio pioneers.

input: While Ozzy Osbourne was working on new solo album material in 2006, Rhino Records released Black Sabbath: The Dio Years, a compilation of songs culled from the four Black Sabbath releases featuring Ronnie James Dio. For the release, Iommi, Butler, Dio and Appice reunited to write and record three new songs as Black Sabbath. The Dio Years was released on 3 April 2007, reaching number 54 on the Billboard 200, while the single "The Devil Cried" reached number 37 on the Mainstream Rock Tracks chart. Pleased with the results, Iommi and Dio decided to reunite the 1981 Mob Rules era line-up for a world tour. While the line-up of Osbourne, Butler, Iommi and Ward were still officially called Black Sabbath, the new line-up opted to call themselves Heaven & Hell, after the album of the same name, to avoid confusion. When asked about the name of the group, Iommi stated "it really is Black Sabbath, whatever we do... so everyone knows what they're getting [and] so people won't expect to hear 'Iron Man' and all those songs. We've done them for so many years, it's nice to do just all the stuff we did with Ronnie again." Ward was initially set to participate, but dropped out before the tour began due to musical differences with "a couple of the band members". He was replaced by former drummer Vinny Appice, effectively reuniting the line-up that had featured on the Mob Rules (1981) and Dehumanizer (1992) albums. Heaven & Hell toured the U.S. with openers Megadeth and Machine Head, and recorded a live album and DVD in New York on 30 March 2007, titled Live from Radio City Music Hall. In November 2007, Dio confirmed that the band had plans to record a new studio album, which was recorded in the following year. In April 2008 the band announced the upcoming release of a new box set and their participation in the Metal Masters Tour, alongside Judas Priest, Motorhead and Testament. The box set, The Rules of Hell, featuring remastered versions of all the Dio fronted Black Sabbath albums, was supported by the Metal Masters Tour. In 2009, the band announced the name of their debut studio album, The Devil You Know, released on 28 April. On 26 May 2009 Osbourne filed suit in a federal court in New York against Iommi alleging that he illegally claimed the band name. Iommi noted that he has been the only constant band member for its full 41-year career, and that his bandmates relinquished their rights to the name in the 1980s, therefore claiming more rights to the name of the band. Although, in the suit, Osbourne was seeking 50% ownership of the trademark, he said that he hoped the proceedings would lead to equal ownership among the four original members. In March 2010, Black Sabbath announced that along with Metallica they would be releasing a limited edition single together to celebrate Record Store Day. It was released on 17 April 2010. Ronnie James Dio died on 16 May 2010 from stomach cancer. In June 2010, the legal battle between Ozzy Osbourne and Tony Iommi over the trademarking of the Black Sabbath name ended, but the terms of the settlement have not been disclosed.

Answer this question "was it successful?"
output:
The Dio Years was released on 3 April 2007, reaching number 54 on the Billboard 200,