What is the shortcut (faster, but less accurate) method for determining training heart rate range?

Sushi or chicken tender with barbecue sauce? which is your favorite? which is better for your health?

How do the uv rays cause damage?   what exactly causes the skin to burn;   can you be more specific about this mechanism?   3. how do photosensitive medications increase a person's sensitivity to sunlight and therefore increase their risk of getting burned?     what kind of medications can increase photo-sensitivity, can you think of some examples?

How does fluid in the body become lymph? how is it returned to your blood