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The publication of this information does not constitute the practice of medicine, and this information does not replace the advice of your physician or other health care provider. Before undertaking any course of treatment, the reader must seek the advice of their physician or other health care provider. Antioxidants include some vitamins and minerals, but to appreciate the value of antioxidants, you first need to understand the potential dangers of free radicals, a form of oxygen that has been chemically modified into a highly unstable substance. Free radicals are unstable because they are missing electrons, which must be replaced. So they seek out other compounds in the body. Steal electrons to restore stability. If the compound giving up its electrons is the fat and protein in an LDL-cholesterol molecule, the result is the formation of fatty lesions in the walls of the blood vessels -- the hallmark of atherosclerosis. For instance, they form in the normal course of the day, just by our breathing in oxygen.|Smilodon fatalis, the saber-tooth cat: a little like a tiger and a little like a bear. See more pictures of big cats. It's easy to imagine that saber-tooth cats hunted the way today's tigers do -- after all, many people call the extinct felines "saber-tooth tigers." Tigers hunt alone, waiting until twilight and using vegetation or patches of light and shadow to hide themselves. A tiger will stalk its prey until it's close enough to strike in a couple of quick leaps. The kill comes when the tiger bites through the back of its victim's neck and severs the spinal cord. Tigers can also strangle their prey with a long-lasting bite to the throat. The most well-known of the extinct felines, Smilodon fatalis, shared some physical traits and hunting patterns with tigers. But saber-tooth cats may have been social animals, like today's lions. Many saber-tooth species also had the sheer physical bulk of bears. Today's big cats have long canines, too -- but they're tiny compared to the elongated teeth of a saber-tooth.




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