Today - Can a pessimist become an optimist? - ÃÛÑ¿´«Ã½ Sounds

Today - Can a pessimist become an optimist? - ÃÛÑ¿´«Ã½ Sounds
Can a pessimist become an optimist?
Michael Mosley, the presenter of tonight's Horizon programme, speaks to Evan Davis.
Michael Mosley, the presenter of tonight's Horizon programme, speaks to Evan Davis.