Whether it’s tied to an entrepreneurial vision or simply made part of your every day life, giving pays back in ways you might not anticipate. Whether you’re helping a teacher and classroom in need, donating clothes or canned foods to a local shelter, volunteering for disaster relief, or giving up your birthday to help others get clean water, you’re doing something that makes a difference in the world. Don’t think you have to wait to do these things—get started right away because here’s the secret: there is compound interest in altruism.