Iridium is a chemical element with symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium) based on measured density, although calculations involving the space lattices of the elements show that iridium is denser. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable.

Iridium was discovered in 1803 among insoluble impurities in natural platinum. Smithson Tennant, the primary discoverer, named iridium for the Greek goddess Iris, personification of the rainbow, because of the striking and diverse colors of its salts. Iridium is one of the rarest elements in Earth's crust, with annual production and consumption of only three tonnes. ¹⁹¹Ir and ¹⁹³Ir are the only two naturally occurring isotopes of iridium, as well as the only stable isotopes; the latter is the more abundant of the two.

The Iridium satellite constellation is a satellite constellation providing voice and data coverage to satellite phones, pagers and integrated transceivers over the Earth's entire surface. Iridium Communications owns and operates the constellation and sells equipment and access to its services. It was originally conceived by Bary Bertiger, Dr. Ray Leopold and Ken Peterson in late 1987 (and protected by patents by Motorola in their names in 1988) and then developed by Motorola on a fixed-price contract from July 29, 1993 to November 1, 1998 when the system became operational and commercially available.

Iridium is a chemical element.

Iridium may also refer to:

See also

Denial, in ordinary English usage, is asserting that a statement or allegation is not true. The same word, and also abnegation (German: Verneinung), is used for a psychological defense mechanism postulated by psychoanalyst Sigmund Freud, in which a person is faced with a fact that is too uncomfortable to accept and rejects it instead, insisting that it is not true despite what may be overwhelming evidence. An individual that exhibits such behaviour is described as a denialist or true believer. Denial also could mean denying the happening of an event or the reliability of information, which can lead to a feeling of aloofness and to the ignoring of possibly beneficial information.

The subject may use:

In psychoanalysis

Denial is a 1990 American drama film, written and directed by Erin Dignam. The film features Robin Wright as "Sarah," a sometime actress and tall, dark, handsome loner, "Michael" (Jason Patric), as lovers, as they were in real life, (before she was with Sean Penn). "Michael" inhabits the realm of obsessional love with "Sarah" becoming his sickness, as he calls it—or her.

Cast

External links

Denial is a mystery novel written by Stuart M. Kaminsky, a Grandmaster of the Mystery Writers of America. It is a Lew Fonesca mystery and was released July 8, 2005.

The Two Mysteries

This novel has two mysteries.

Lew, a process server and an occasional amateur detective, is summoned by an elderly resident in Seaside Assisted Living asking him to prove that a murder has occurred in the facility because no one will believe her. A mother, named Nancy Root, pays him to find the hit-and-run driver who killed her son.

Main characters