Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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Immediately after injury, the knee swells rapidly over the next 3 to 6 hours. Swelling makes the knee stiff and painful, with difficulty walking. A later result is pain and weakness. The knee sometimes dislocates at the time of the tear.