Have you ever asked yourself why egg yolks are yellow? And what's the difference between eggs with yolks that are pale yellow, deep yellow, or even orange? There are some very interesting answers to this question. And the answers all point out to how nutritious and important egg yolks are to our diets.

If you needed one more reason to make sure your vitamin D levels are adequate, Duke-NUS Medical School and Duke University can give it to you. Researchers at these institutions recently conducted a study of elderly Chinese people that linked low vitamin D levels to a condition that we're all hoping to avoid as we age.

If there's one place you should be able to go without worrying about acquiring a disease, it's the hospital. But you and I both know that hospitals are full of bacteria that can be life-threatening. In fact, a review study published in the <em>New England Journal of Medicine</em> found that an estimated two million people acquire infections while they're in the hospital every year — and about 90,000 of them die. Even if you do survive the infection, getting one can add an average of two weeks to your stay. The medical bills for these infections add up to over $9.5 billion.