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.
INDIVIDUALS WITH DISABILITIES: Defined as an individual who has a physical or mental impairment that constitutes a substantial limitation on a major life activity, a person with record of such an impairment, or a person who is perceived as having such an impairment.