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. The lack of competent physical and mental faculties; the absence of legal capability to perform an act. The term disability usually signifies an incapacity to exercise all the legal rights ordinarily possessed by an average person. Convicts, minors, and incompetents are regarded to be under a disability. The term is also used in a more restricted sense when it indicates a hindrance to marriage or a deficiency in legal qualifications to hold office.