Knowing how to improve concentration will help you feel confident and weather periods of stress, when your focus takes a hit. Do you live near a park? Go for a walk.
If the summer sun gives you an especially big mood boost, consider whether you could benefit from a sunlamp or Vitamin D supplement in the darker months.
New research suggests that the importance of friendship increases with age. This works both ways—quarrels with friends, it suggests, is tied to chronic health problems.