It’s 2pm: you had a meeting before school, cleaned up a bloody nose, and now, with 30 minutes left of class, your last whiteboard marker has dried up. Sometimes, all you can do is laugh. Laughter may not substitute for proper medical care, but research does point to serious health benefits. Laughter can relieve stress and improve your memory, according to Loma Linda University. It also boosts the immune system—something every teacher needs—and even helps out your cholesterol numbers.