Kindness might once have been considered something of a soft topic, but it has begun to be taken seriously within academic research. When developmental psychologist Robin Banerjee ... surveyed past research, he found just 35 papers on kindness in psychology journals in the whole of the 1980s. In the past decade, there were more than 1,000. But there is still plenty to discover. One morning, people walking down a street in the Canadian city of Vancouver were asked to take part in an experiment. They were given an envelope containing either a $5 or $20 note. Half the people were instructed to spend the money on themselves. The other half were instructed to use the money to buy a present for someone else or to donate the money to charity. Whether they had $5 or $20 made no difference. The people who had spent it on someone else felt significantly happier than those who treated themselves. This is just one of many studies which has found that acting kindly can improve your wellbeing. In a meta-analysis, Oliver Scott Curry ... found that behaving kindly can have a small to medium effect on our wellbeing. On the BBC radio programme The Kindness Test ... neuroscientist Dan Campbell-Meiklejohn told me that this can seem counterintuitive. "Kindness can cost us, yet we experience a sense of reward in parts of our brain when we are kind to others, just as we do when eat yummy food or have a pleasant surprise. These parts of the brain become active and motivate us to do them again and again."