Harvard University is launching a new center to study the connection between happiness and health.

It's founded with a $21 million donation from the Lee Kum Kee family, which runs two international companies that sell food and health products.

The center's primary goal will be to answer whether happiness makes people healthier, a question that has split scientists.

Some researchers say there's a link, and some studies have tied optimism to better heart health. But a recent study concluded that there's no direct tie between happiness and mortality.

The Harvard center plans to provide more evidence, and to explore what makes people happy. It also hopes to explore how factors like income and race play a role.

The goal is to produce findings that can keep people healthy and happy.