Last week, I attended the Vator Splash event, where I had the opportunity to listen to a talk by Tony Hseih, CEO of Zappos (sold to Amazon.com in 2009 for $1.2 billion). While his talk was mainly about building Zappos and the company culture within, it was the last 5 min of his presentation that really inspired me. He talked about the science of happiness and referred to one such framework, where he defined 3 levels of happiness as Pleasure, Passion and Purpose.