Flerovium (formerly ununquadium) is the radioactive chemical element with the symbol Fl and atomic number 114. The element is named after Soviet physicist Georgy Flyorov, the founder of the Joint Institute for Nuclear Research in Dubna, Russia, where the element was discovered.

About 80 decays of atoms of flerovium have been observed to date, 50 directly and 30 from the decay of the heavier elements livermorium and ununoctium. All decays have been assigned to the five neighbouring isotopes with mass numbers 285–289. The longest-lived isotope currently known is ²⁸⁹Fl with a half-life of ~2.6 s, although there is evidence for a nuclear isomer, ^289bFl, with a half-life of ~66 s, that would be one of the longest-lived nuclei in the superheavy element region.

Chemical studies performed in 2007 strongly indicate that flerovium possesses non-eka-lead properties and appears to behave as the first superheavy element that portrays noble-gas-like properties due to relativistic effects.

In December 1998, scientists at Dubna (Joint Institute for Nuclear Research) in Russia bombarded a ²⁴⁴Pu target with ⁴⁸Ca ions. A single atom of flerovium, decaying by 9.67 MeV alpha-emission with a half-life of 30 s, was produced and assigned to ²⁸⁹Fl. This observation was subsequently published in January 1999. However, the decay chain observed has not been repeated and the exact identity of this activity is unknown, although it is possible that it is due to a meta-stable isomer, namely ^289mFl.

Thomas Andrew Lehrer (born April 9, 1928) is an American singer-songwriter, satirist, pianist, and mathematician. He has lectured on mathematics and musical theater. Lehrer is best known for the pithy, humorous songs he recorded in the 1950s and 1960s.

His work often parodies popular song forms, though Lehrer usually creates original melodies when doing so. A notable exception is his song "The Elements", where he sets the names of the chemical elements to the tune of the "Major-General's Song" from Gilbert and Sullivan's Pirates of Penzance. Lehrer's earlier work typically dealt with non-topical subject matter and was noted for its black humor, seen in songs such as "Poisoning Pigeons in the Park". In the 1960s, he produced a number of songs dealing with social and political issues of the day, particularly when he wrote for the U.S. version of the television show That Was The Week That Was.

In the early 1970s, he retired from public performances to devote his time to teaching mathematics and music theatre at the University of California, Santa Cruz. He did two additional performances in 1998 at a London gala show celebrating the career of impresario Cameron Mackintosh.