The brain might not take up much space in our bodies, but it is one powerful organ. Our brains use up to 20 percent of our total energy just to do basic functions. That means, on an average day, your brain’s work can burn over 300 calories. That’s like running three miles. Even better … According to a new study published in the journal Frontiers in Psychology, the harder you think and use your brain, the more calories you burn. Intense memorization or learning a new skill can increase the brain’s calorie burning by 5 percent. That means a rough day at the office or a particularly hard exam might burn off enough calories for you to indulge in an extra portion of dessert. Thanks, brain! (Buzz 60)