Today is international day of happiness, a day started by the United Nations in 2012. The first year that the day was celebrated, orange 'happiness walls' sprang up in many cities - places for people to share their ideas for achieving happiness.
So we thought we'd do our own happiness wall with some tips for achieving happiness in life.
What would you write on your own happiness wall? Visit Twitter and tell us what you'd put on your wall using #HappinessWall and we'll add our favourite tips to our own wall.