Katie Thornton, host of The Divided Dial, a Peabody Award-winning series on WNYC's On the Media and a freelance print and audio journalist, talks about Esperanto, its history as a language invented to bring people together across borders, and who is speaking it today.

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Photo: View taken on on April 5, 2017 shows historic Esperanto text books at the Esperanto library inside the Ludwik Zamenhof centre in Bialystok, eastern Poland, on April 5, 2017. Ludwik Zamenhof, the creator of the synthetic language of Esperanto, was born in 1859 in Bialystok. / AFP PHOTO / Janek SKARZYNSKI (Photo credit should read JANEK SKARZYNSKI/AFP via Getty Images)

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