Your biological clock is probably the most reliable machinery in your body: it runs 24-7 to regulate vital functions from sleep to metabolism and remains stubbornly steadfast when you fly across time zones. Scientists still don't know exactly how this this internal clock works. But now researchers have identified a missing gear that could offer a cure for jet lag.

We eliminated measles in the U.S. in 2000. Somebody should tell the measles. Because even though the virus has no permanent home stateside, it keeps getting in—more and more, it seems.

Sleep is a time suck. If you multiplied the average recommended number of hours we should sleep in a day—eight for a typical adult—by the number of days in an average lifespan (78.8 years in the United States), that would amount to about 9,587.3 days. That's one third of your life spent unconscious. From an evolutionary standpoint, sleep is quite literally a waste of your time, yet it's fought its way through countless years of adaptation in nearly every living animal on Earth. So it must be important, right?

The Karelia regions of Finland and Russia are remarkably similar. They have unique architecture, they share a common heritage and genes, and speak similar dialects. But if you live on the Finnish side, you'll have around ten times as many neighbors with celiac disease.

Air Pollution kills. A study released yesterday in the journal Nature found that in 2007, air pollution lead to the premature deaths of 3.45 million people worldwide—a number equivalent to the population of the state of Connecticut. And to add insult to injury, air pollution doesn't respect borders.

Spinach could be good for your heart in more ways than one. It's packed with fiber, vitamin A, and the branching vasculature necessary for cells to absorb nutrients.