It seems that as they get older, many people expect their knees to give out. Osteoarthritis of the knee is, in fact, common in those over age 50 and knee arthroscopy is one of the most frequently done orthopedic surgeries.1 Also, increasing numbers of people are undergoing total knee replacements. The

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Comparisons between the inner world and the outer world have been frequently drawn by philosophers, nature writers, and visual artists. For example, "seeing the universe in a grain of sand" is a well-known aphorism. The number of neurons in your brain has been compared to the number of stars in the Milky

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