Dr David Hamilton discussing how kindness makes us happy and benefits the heart through the effects of the hormone oxytocin.

After completing his PhD, David worked for four years in the pharmaceutical industry developing drugs for cardiovascular disease and cancer. During this time he also served as an athletics coach and manager of one of the UK's largest athletics clubs, leading them to three successive UK finals.

Upon leaving the pharmaceutical industry, David cofounded the international relief charity Spirit Aid Foundation and served as a director for two years.

He is now a bestselling author of seven books published by Hay House and also writes a regular blog for the Huffington Post.

www.drdavidhamilton.com