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A high quality education doesn't have to come at a high cost. In fact, it's possible to take classes from big names like Yale, MIT, and Tufts without ever submitting an application or paying a cent in tuition. We've compiled 200 online classes from these and other respected institutions, and you can take all of them with no strings attached.

While you can't get college credit for taking open courseware classes, you can make the most of the information and education they offer both in personal and professional aspects of your life. After all, even if you're not working towards a degree, taking the same courses as those in the ivy league can't possibly hurt you and may even be able to better keep you informed and on the cutting edge of what's going on in your field. So how can you make the most of these free online courses? Here are resources we've collected that can help you search for classes, find information and learn everything you need to know about how open courseware works.

Heart scan scores starting dropping not just 2%, or 8% . . . but 24%, 30%, 50% and more. We also began to see a larger proportion of people achieving these larger successes. Why? I attribute the surge in success to the addition of vitamin D. With vitamin D added to the mix of strategies in Track Your Plaque, HDL cholesterols went up much higher, LDL dropped further, blood sugars dropped, blood pressures dropped. People felt better, had more energy, gained more clarity in thought. And heart scan scores dropped more readily.

Your vision is one the most precious gifts you have. Maintaining good vision and eye health throughout your lifetime is important. There are a number of proactive tips that can help you to take care of your most delicate sensory organ-your eyes.

Deficiency of K2 in both mice and humans is associated with coronary calcification; low vitamin K2 levels are associated with increased activity of Gla matrix protein, an enzyme that causes calcium deposition in artery walls. People who take warfarin (Coumadin®), a potent blocker of vitamin K2, experience more arterial and heart valve calcification. The 2004 Rotterdam Heart Study was the experience that really brought this concept closer to our interests. This well-conducted study of 4800 Dutch demonstrated an association of vitamin K2 intake with 57% reduction in cardiovascular events and lesser degrees of aortic calcification (another surrogate for atherosclerosis). Benefit appeared to be associated with a daily K2 intake of 32.7 micrograms per day (Geleijnse JM et al 2004). An important corollary of this study is that it suggests that a vitamin K2-mediated reduction in coronary calcification is accompanied by reduced likelihood of heart attack and other events.

Research has uncovered the fact that vitamin K also plays a crucial role in maintaining bone health. It was found that the amount of vitamin K required to halt bone absorption leading to osteoporosis requires much greater intakes than that required for blood clot regulation. Further, it appears that bone and vascular tissue (like coronary arteries) maintain a preference for a different form of vitamin K than that required for blood clotting regulation. Rather than vitamin K1 needed for clotting, vitamin K2 is the form preferred by bones and arteries (Schurgers LJ et al 2001). It appears that much of the information generated over the years for vitamin K focused on the K1 form, ignoring the K2 form necessary for bone and vascular health. Normal deposition of calcium occurs only in bone and in teeth. Abnormal deposition of calcium in the body occurs in three places: the inner lining of the arteries of the body (the intima) that causes atherosclerotic plaque; the muscle layer of arteries ("medial calcification"); and heart valves. K2 appears to be the form of vitamin K responsible for controlling these phenomena.

MedlinePlus will direct you to information to help answer health questions. MedlinePlus brings together authoritative information from NLM, the National Institutes of Health (NIH), and other government agencies and health-related organizations. Preformulated MEDLINE searches are included in MedlinePlus and give easy access to medical journal articles. MedlinePlus also has extensive information about drugs, an illustrated medical encyclopedia, interactive patient tutorials, and latest health news.

"Meat eating made us human. The anthropological evidence strongly supports the idea that the addition of increasingly larger amounts of meat in the diet of our predecessors was essential in the evolution of the large human brain. Our large brains came at the metabolic expense of our guts, which shrank as our brains grew. In April 1995 an article appeared in the journal Current Anthropology that was an intellectual tour de force and, in my view, an example of a perfect theoretical paper. "The Expensive-Tissue Hypothesis" (ETH) by Leslie Aiello and Peter Wheeler demonstrated by a brilliant thought experiment that our species didn't evolve to eat meat but evolved because it ate meat. It was our gradual drift toward the much higher quality diet provided by food from animal sources that allowed us to develop the large brains we have. It was hunting and meat eating that reduced our GI tracts and freed up our brains to grow. As I wrote at the start of this post, the evidence indicates that we didn't evolve to eat meat - we evolved because we ate meat."

Meat eating made us human. The anthropological evidence strongly supports the idea that the addition of increasingly larger amounts of meat in the diet of our predecessors was essential in the evolution of the large human brain. Our large brains came at the metabolic expense of our guts, which shrank as our brains grew.