Greek mythology in popular culture elements tantalum and niobium are always found together in nature, and have been named after the King Tantalus and his daughter Niobe. The element promethium also draws its name from Greek mythology, as does titanium, which was named after the titans who in mythology were locked away far underground, which reflected the difficulty of extracting titanium from ore. The U.S. Apollo Space Program to take astronauts to the moon, was named after Apollo, based the god's ability as an archer to hit his target and being the god of light and knowledge. Oceanographer Jacques-Yves Cousteau named his research ship, a
Elvis's Twin Sister its use of colloquial language. The poem goes on to describe Elvis's sister as a nun in a convent, tending its garden. At Poetry Live in London, Duffy performed the poem herself on 1 December 2008. Elvis's Twin Sister "Elvis's Twin Sister" is a frequently cited poem by Carol Ann Duffy that is said to reflect "the hidden lives of generations of overlooked women" as part of the collection "The World's Wife", of 30 similar poems dealing with the female relatives of famous men throughout history. The poem is sometimes studied by schoolchildren in the United Kingdom as part of