Changes

- Happiness helps combat disease and disability.

- Happiness helps combat disease and disability.

- Happiness lengthens our lives.<ref>[The Importance of Happiness]</ref>}}

- Happiness lengthens our lives.<ref>[https://www.torrancememorial.org/healthy-living/blog/the-importance-of-happiness/ The Importance of Happiness]</ref>}}

== Happiness and labor productivity ==

== Happiness and labor productivity ==