The Indian Prime Minister has twigged something that President Trump has yet to understand. On Monday, celebrated as World Radio Day, Narendra Modi tweeted his congratulations to ‘all radio lovers and those who work for the radio industry and keep the medium active and vibrant’. Modi uses radio to reach out to those in his country who live in its most remote and inaccessible corners, giving a monthly address to the nation known as ‘Mann Ki Baat’ (or ‘To mind’).