DNA analysis is revealing which speakers traveled where and when.
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
