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.
According to the Americans with Disabilities Act, an individual with a disability is a person who: 1  has a physical or mental impairment that substantially limits one or more major life activities, or. 2  has a record of such an impairment, or. 3  is regarded as having such an impairment.