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, n according to the World Health Organization (WHO) rehabilitation guidelines, impairment of an individual as it affects his or her role in life, such as an inability to work because of a health condition.enial of, n a symptom in which patients deny the existence of a disease or disability. Denial by these patients is a nonrealistic attempt to maintain their predisease status. These patients regard ill health and disability as an imperfection, a weakness, and even a disgrace.