Quicksilver

Quicksilver is the chemical element mercury.

Quicksilver also may refer to

Human individuals

Titled works

Céu

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Céu (Portuguese pronunciation: [sɛu]), whose full name is Maria do Céu Whitaker Poças, is a Brazilian singer-songwriter whose first American album was released on the Six Degrees Records label in April 2007. She was born in São Paulo, Brazil on April 17, 1980, into a musical family, her father being a composer, arranger and musicologist. It was from her father that she learned to appreciate Brazil's classical music composers, particularly Heitor Villa-Lobos, Ernesto Nazaré and Orlando Silva.

By age fifteen she had decided to become a musician and by her late teens she had studied music theory, as well as the violão (nylon-stringed Brazilian guitar). Her songs reveal her many influences, which include samba, valsa, choro, soul, rhythm and blues, hip hop, afrobeat and electrojazz music.

As Céu herself explained, "I have a passion for Black culture, from Jazz divas to Afro beat. Everything comes from Africa. With Samba, I have a very strong connection to the old school that we call 'Samba de raiz' (Root Samba). I am a vinyl listener, so I tried to bring some of that to the CD, mixing it with modern things like rap or even 'Brega', which is the newest thing in Brazil."

CU

CU, Cu, and cu may refer to:

Mathematics, science and medicine

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Halley's Comet

Halley's Comet or Comet Halley (/ˈhæli/ or /ˈheɪli/), officially designated 1P/Halley, is a short-period comet visible from Earth every 75–76 years. Halley is the only known short-period comet that is clearly visible to the naked eye from Earth, and the only naked-eye comet that might appear twice in a human lifetime. Halley last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061.

Halley's returns to the inner Solar System have been observed and recorded by astronomers since at least 240 BC. Clear records of the comet's appearances were made by Chinese, Babylonian, and medieval European chroniclers, but were not recognized as reappearances of the same object at the time. The comet's periodicity was first determined in 1705 by English astronomer Edmond Halley, after whom it is now named.

During its 1986 apparition, Halley's Comet became the first comet to be observed in detail by spacecraft, providing the first observational data on the structure of a comet nucleus and the mechanism of coma and tail formation. These observations supported a number of longstanding hypotheses about comet construction, particularly Fred Whipple's "dirty snowball" model, which correctly predicted that Halley would be composed of a mixture of volatile ices – such as water, carbon dioxide, and ammonia – and dust. The missions also provided data that substantially reformed and reconfigured these ideas; for instance, now it is understood that the surface of Halley is largely composed of dusty, non-volatile materials, and that only a small portion of it is icy.