Learning has been widely documented as a key variable when it comes to health and longevity. When people are engaged in doing and learning new things, their well-being and happiness increase significantly. Find something you have always wanted to know about and set out to research it! Learn how it works, where it came from, what it does, anything and everything you can. Expand your mind, and not just on a superficial level—really explore this new thing with ferocity. Your mind and your mood will thank you.