‘Tongue Tied’ is a short tour through Europe via some of its most at-risk languages. In a series of four articles, Columnist Kieran McGreevy will examine four languages from across the corners of Europe, with the aim of showing what has led these languages to the brink of extinction (and sometimes back), by untying the history of the people, the linguistics of the language itself, and the efforts being made to keep these tongues alive. In this second instalment, Kieran explores the history and revival of Cornish.