In a new study, students who brought water into exams scored higher than those who didn't. The researchers believe staying hydrated lowered anxiety and improved thinking power. We get it. Despite the never-ending health benefits, staying hydrated may not top your daily to-do list. If you can't get yourself to guzzle enough H2O, new findings might offer extra motivation: Drinking water can boost your brain power. In a study presented Wednesday at the British Psychological Society Annual Conference in London, researchers found that students who brought water into exams performed better than those who didn't. To make sure they hadn't simply concluded higher-scoring students are more likely to bring water into a test, they used the students' past coursework grades to set a general ability control. So even among generally poorer-scoring students, bringing water into the exams boosted their grades. "The results imply that the simple ac...