concave area
81Nose ride — Noseriding (AKA Tipriding the current term) is the art of maneuvering the surfboard from the front end. Next to getting tubed (AKA barreled means placing your whole body inside the curl of the wave), noseriding is the most accomplished move in… …
82Rainbow — For other uses, see Rainbow (disambiguation). Double rainbow and supernumerary rainbows on the inside of the primary arc. The shadow of the photographer s head on the bottom marks the centre of the rainbow circle (antisolar point). A rainbow is… …
83base — 1. The lower part or bottom; the part of a pyramidal or conical structure opposite the apex; the foundation. SYN: basis [TA], basement (1). 2. In pharmacy, the chief ingredient of a mixture. 3. In chemistry, an …
84Normal distribution — This article is about the univariate normal distribution. For normally distributed vectors, see Multivariate normal distribution. Probability density function The red line is the standard normal distribution Cumulative distribution function …
85Sintering — is a method used to create objects from powders. It is based on atomic diffusion. Diffusion occurs in any material above absolute zero but it occurs much faster at higher temperatures. In most sintering processes the powdered material is held in… …
86Risk aversion — is a concept in psychology, economics, and finance, based on the behavior of humans (especially consumers and investors) while exposed to uncertainty. Risk aversion is the reluctance of a person to accept a bargain with an uncertain payoff rather …
87Crookes tube — A Crookes tube. The electrons travel in straight lines from the cathode on the left, shown by the shadow cast by the cross on the fluorescence on the righthand wall. The anode is at the bottom. A Crookes tube is an early experimental electrical… …
88List of The Colbert Report episodes (2007) — This list of episodes of The Colbert Report details information on all 2007 episodes of The Colbert Report, a popular Comedy Central show hosted by Stephen Colbert, and produced by Colbert, Jon Stewart, and Ben Karlin. Colbert plays the role of a …
89Mosque of Amr ibn al-As — Entrance to the Mosque of Amr ibn al As. The sign on the roof says Allahu Akbar . The Mosque of Amr ibn al As (Arabic: جامع عمرو بن العاص), also called the Mosque of Amr, was originally built in 642 AD, as the center of the newly founded capital …
90fossa — A depression usually more or less longitudinal in shape below the level of the surface of a part. [L. a trench or ditch] acetabular f. [TA] a depressed area in the floor of the acetabulum superior to the …
