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.
3. the United States Government defines a disability as âa physical or mental impairment that substantially limits one or more of an individual's major life activities:â this includes both those individuals with a record of an impairment and those regarded as having such an impairment.