Many people avoid the sun, scared of its potential danger. Why? Yes, too much sun will give you cancer, but those who get more sun exposure are also less likely to develop other cancers like colon, breast, and prostate. Vitamin d improves your immune system, your attitude, and your health, mental and physical. So when it gets sunny—a hard vision for those of us in the doldrums of winter—don’t stay cooped up inside, go out in the sun, it’s better for you than you think.