When you read this
Stop what you're doing and contact the person you miss. Whether this means mailing them a letter, calling them on the phone, sending them a text, knocking on their door, emailing them, or just walking up them in person, there's no harm in a simple hello and letting that person know that you were thinking of them. I bet if everyone did this, they would find the person who they were missing has been missing them too. Do it.