So, mum was right. Thank you letters aren’t just polite and the right thing to do, they have been scientifically proven that there are significant benefits to writing thank you cards – to both the writer and the recipient. According to Amit Kumar of the University of Texas, most people don’t write letters because they feel awkward or anxious about how they will be received, but his study showed that we underestimate how surprised and happy people are to receive them. Speaking in Psychological Science journal, Kumar says: “It only takes a couple of minutes to compose letters like these, thoughtful ones and sincere ones. It comes at little cost, but the benefits are larger than people expect.” If it makes you feel good to make someone else feel good, why not give it a go?