I think thereâs fear of intimidation, harassment being legitimized by the fact that there is a high rate of crime, especially among young black men, Williams said. No. 1 cause of death, young black men 15 to 34 â murder.
(plural convolutions). 1  Something that is folded or twisted. 2  Any of the folds on the surface of the brain. 3  The shape of something rotating; a vortex. ( 4 mathematics) A form of moving average. ( 5 computing) A function which maps a tuple of sequences into a sequence of tuples.
For other uses, see Calculus (medicine), Enterolith, and Nodule (geology). A concretion is a hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur.