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.
disabilities. 1  1: the condition of being disabled. 2  2: limitation in the ability to pursue an occupation because of physical or mental impairment. 3  3: a physical or mental illness, injury, or condition that incapacitates in any way; also : a program providing financial support to one affected by disability went on disability after the injury.