Languages carry the traditions, histories and identities of the people who speak them. When a language disappears, a unique way of thinking, storytelling and understanding the world is lost forever. Friday 21 February marks the 25th anniversary of International Mother Language Day (IMLD), a worldwide annual commemoration to promote awareness of linguistic and cultural diversity and advance multilingualism. Do you know what happened on 21 February 1952 when Bengali students in, at the time, East Pakistan (now Bangladesh) rallied for the recognition of Bengali as an official language?