Okay, okay—yes, thank-you notes are something your mom always made you write for birthday gifts as a kid. But they aren’t old-fashioned: they’re a timeless sign of appreciation that can directly benefit you in college. In fact, saying thank you with a simple, heartfelt message in a card gives you a chance to reflect on how that person helped you, create and share positive vibes, and even strengthen your networking skills. You can write one for the person who supervised your internship over the summer, your boss at an on-campus job, the professor who wrote you a letter of recommendation, a friend who passed along a hot tip about a teaching assistant opportunity, or a mentor who took you out for coffee. Think of a couple of people who you’d like to say thank you to, and jot down a few lines in a nice card. It only takes a few minutes to make someone’s day.