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.
A disability as defined by the ADA is a physical or mental impairment that substantially limits one or more major life activities. An individual with a disability as defined by the ADA: 1  has a physical or mental impairment that substantially limits one or more major life activities, 2  has a record of such an impairment, or.