Downs: The history of a disability

For 150 years, Down's Syndrome has constituted the archetypal mental disability, easily recognisable by distinct facial anomalies and physical stigmata. In a narrow medical sense, Down's syndrome is a common disorder caused by the presence of all or part of an extra 21st chromosome. It is named after John Langdon Down, the British asylum medical superintendent who described the syndrome as Mongolism in a series of lectures in 1866. In 1959, the disorder was identified as a chromosome 21 tri...