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Random orbital sander - Random orbit sanders are hand-held power sanders where the action is a random orbit. They were first introduced in the early 1990s and quickly became tremendously popular.
Protoplanetary disc - A protoplanetary disc (or proplyd) is an accretion disc surrounding a T Tauri star. They differ from the discs surrounding the primary components of close binary systems in their size and temperature.
Random access machine - In computer science, random access machine (RAM) is an abstract machine which has an unlimited number of registers (in contrast with a register machine, which has a finite number of registers) of unlimited size which can be accessed randomly.
Effective population size - In population genetics, the concept of effective population size Ne was introduced by the American geneticist Sewall Wright, who wrote two landmark papers on it (Wright 1931, 1938). He defined it as "the number of breeding individuals in an idealized population that would show the same amount of dispersion of allele frequencies under random genetic drift or the same amount of inbreeding as the population under consideration".
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