Jazz is a musical tradition and style of music that originated at the beginning of the 20th century in African American communities in the Southern United States from a confluence of African and European music traditions. From its early development until the present, jazz has incorporated music from 19th and 20th century American popular music. Its West African pedigree is evident in its use of blue notes, improvisation, polyrhythms, syncopation, and the swung note.

Rollerblade is a type of inline skate. The name is a registered trademark owned by Nordica, part of the Tecnica Group of Trevignano, Treviso, Italy. Scott Olsen (b. 1960) and Brennan Olson (b. 1964) sold their Minneapolis company and it became Rollerblade, Inc. which has changed hands over time between Nordica, Benetton Group and Tecnica. The Rollerblade trademark has been in use since March 1983. While the company does not want the meaning of its trademark to be diluted, the term "rollerblade" is frequently used in casual conversations as a brandnomer for any inline skate, regardless of brand. This misuse has also appeared on "official" items such as signs, buildings, and sidewalks.

Psychology is the science of mind and behavior. Its immediate goal is to understand humanity by both discovering general principles and exploring specific cases. For many practitioners, one goal of applied psychology is to benefit society. In this field, a professional practitioner or researcher is called a psychologist, and can be classified as a social scientist, behavioral scientist, or cognitive scientist. Psychologists attempt to understand the role of mental functions in individual and social behavior, while also exploring the physiological and neurobiological processes that underlie certain functions and behaviors.