Saturday is World Radio Day.  110 years old radio continues to evolve, innovate and connect. Here on Newstalk we are going to celebrate Radio as a powerful medium for celebrating humanity in all its diversity. Henry McKean met regular radio listeners and asked what their earliest radio memory was. He looks back through the archives of some of Ireland's biggest broadcasters. Henry sent us his love letter to radio. With the late Marian Finucane talking to her friend Nuala O'Faolain shortly before her death in 2008.