The Euphemism Treadmill

John McWhorter on the evolution from "crippled" to "handicapped" to "differently abled" and why no such term is likely to stick around long. Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at www.slate.com/podcastsplus. Twitter: @lexiconvalley Facebook: facebook.com/LexiconValley Email: lexiconvalley@slate.com  Learn more about your ad choices. Visit megaphone.fm/adchoices