To understand why Linux has become so popular, it is helpful to know a little bit about its history. The first version of UNIX was originally developed several decades ago and was used primarily as a research operating system in universities.
Usage Note: Disabled is the clear preference in contemporary American English for referring to people having either physical or mental impairments, with the impairments themselves preferably termed disabilities.
Disability is the term used to define a restriction in the ability to perform a normal activity of daily living which someone of the same age is able to perform. For example, a three-year-old child who is not able to walk has a disability because a normal three-year-old can walk independently.hus, disability is a complex phenomenon, reflecting an interaction between features of a personâs body and features of the society in which he or she lives. Individuals may also qualify as disabled if they have had an impairment in the past or are seen as disabled based on a personal or group standard or norm.