When people exercise, we talk about endorphins, but endorphins are just short-term. The reason why exercise is valuable is it trains your brain to believe, 'My behavior matters,' which is optimism.

Positive and engaged brains are a company's greatest assets. More than time and even more than productivity, people must be happy.

Success does not mean happiness. Check out any celebrity magazine to look for examples to disabuse you of thinking that being beautiful, successful or rich will make you happy.

Too many people limit their happiness and success by assuming that taking time off from work will send a negative message to their manager and slow their career advancement.

The research says that being successful doesn't automatically make you happier, but being happier - being more positive - makes you more successful.

Waiting to be happy limits our brain's potential for success, whereas cultivating positive brains makes us more motivated, efficient, resilient, creative, and productive, which drives performance upward.