When you're feeling a bit down, striking up conversations with strangers might be the last thing on your mind.
But such encounters may actually make you feel happier, research has suggested.
It is one of eight simple 'happiness hacks' devised by scientists at the University of Bristol.
Writing gratitude letters, conducting acts of kindness and trying out meditation are among other key measures found to improve mental wellbeing.
The four other checkpoints relate to getting sufficient sleep, exercising, savouring experiences and drawing attention to positive parts of the day, for instance writing down 'three good things' that happened.