There are several time-honored traditions connected to Valentine’s Day, and one of them is the exchange of greeting cards among classmates. Each year, primary school children choose a box of valentines depicting their favourite superhero, princess, cuisine, or Internet fad, fill out a card for each of their classmates, and then distribute the cards in class among the decorated shoeboxes. Parents have been grumbling about this custom for years, despite the fact that youngsters may find it enjoyable if they manage to persuade their parents or guardians to buy cards with stickers or light sticks. Many adults may be puzzled…