There was free music, comedy and laughter yoga as an International Day of Happiness was held at the Cambridge Biomedical Campus. Focused on the importance of positivity, happiness and good mental health, the event, which took place in the afternoon and evening of Wednesday, 20 March, began with laughter yoga. Gill Wilson, campus enlivenment lead, said the atmosphere was “electric”, adding that around 200 people came. On the benefits of laughter yoga, she said: “Your brain doesn’t know the difference between laughter which is false, as in I’m going to make myself laugh, and real laughter when y…