We all understand R numbers now, and have been trying to keep the COVID R number below 1. From this podcast https://www.bbc.co.uk/programmes/p096kzt8 I learned that research has shown that the R number for kindness is between 4 and 5. Each person being kind passes that on to 4 to 5 others. Each of these in turn pass it to four or five more, through three ‘degrees of separation’. The end point is that, using 5 as the R number, 1 person’s kindness will make 125 people happier. Tell that to your class!