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 disabled insured worker under the age of 65; a person who became disabled before age 22 who is a dependent of a deceased insured parent or a parent entitled to title II disability or retirement benefits; and. a disabled widow or widower age 50-60 if the deceased spouse was insured under Social Security.