Yellowcake (also called urania) is a kind of uranium concentrate powder obtained from leach solutions, in an intermediate step in the processing of uranium ores. Yellowcake concentrates are prepared by various extraction and refining methods, depending on the types of ores. Typically, yellowcakes are obtained through the milling and chemical processing of uranium ore forming a coarse powder which has a pungent odor, is insoluble in water and contains about 80% uranium oxide, which melts at approximately 2878 °C.

The ore is first crushed to a fine powder by passing raw uranium ore through crushers and grinders to produce "pulped" ore. This is further processed with concentrated acid, alkaline, or peroxide solutions to leach out the uranium. Yellowcake is what remains after drying and filtering. The yellowcake produced by most modern mills is actually brown or black, not yellow; the name comes from the color and texture of the concentrates produced by early mining operations.

Initially, the compounds formed in yellowcakes were not identified; in 1970, the U.S. Bureau of Mines still referred to yellowcakes as the final precipitate formed in the milling process and considered it to be ammonium diuranate or sodium diuranate. The compositions were variable and depended upon the leachant and subsequent precipitating conditions. Among the compounds identified in yellowcakes include: uranyl hydroxide, uranyl sulfate, sodium para-uranate, and uranyl peroxide, along with various uranium oxides. Modern yellowcake typically contains 70 to 90 percent triuranium octoxide (U₃O₈) by weight. Other oxides such as uranium dioxide (UO₂) and uranium trioxide (UO₃) exist.

Kaki King (b. Katherine Elizabeth King, August 24, 1979 in Atlanta, Georgia) is an American guitarist and composer. King is known for her percussive and jazz-tinged melodies, energetic live shows, use of multiple tunings on acoustic and lap steel guitar, and her diverse range in different genres.

In February 2006, Rolling Stone released a list of "The New Guitar Gods," on which King was the sole woman and youngest artist (beating Derek Trucks in age by two months as the youngest on the list). In addition to a 10-year career that includes five LP and two EP albums, King has also scored music for television and film. She worked alongside Eddie Vedder and Michael Brook contributing music for the soundtrack to Sean Penn's Into the Wild, for which the trio received nominations for a Golden Globe Award for Best Original Score.

King was born the first of two daughters. While still a small child, her father noticed her natural musical ability, and encouraged her interest in music. She was introduced to the guitar at the age of four and played for several years, but after taking up the drums a few years later, they became her primary instruments as an adolescent.