I heard part of a R4 programme this week but can't find it now.
What I can remember is that they were talking about the benefits of laughter.
They talked about how we can distinguish between real and fake laughter (and this skill is learned and stays with us all our lives).
They played a fake and real laugh and asked the audience which they thought was which.
It was on during the day, maybe Thursday or Friday this week.
Can anyone help?