2/5 In Scotland, last year the sales of Self-help books were up by 15%. Which, suggests many of us are trying to improve our lives in some way. For this BBC Radio Scotland Series, Investigative Journalist Neil Mackay is going in 'The Pursuit of Happiness'. Neil wants to try and find out what exactly is the key to a happier life? But do these answers really lie between the covers of a self-help book and what makes these self-help guru's think they have all the answers? Today Neil speaks to Author and Scientist Dr David Hamilton who believes the secret to happiness lies in our thoughts...and what's more, he can prove it!...so is happiness, really as simple as positive thinking? Tune in to find out. Show less