What to get loved ones for Christmas – the perennial problem? Even if you’ve already found what you believe to be the ideal gift, you might not better off than those of us who have yet to make up our minds because you don’t know that it’s the right one? Will your other half glow with delight on the big day, or will you be rewarded with a long face and a polite ‘that’s nice’? Yet choosing a gift needn’t be left entirely to chance. What use is the academic study of happiness if not to inform us what it is that makes people happy?