Fun and interesting facts

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Fun and interesting about the human body. More than half the bones in your body are located in you hands and feet. There is enough iron in the human body to make one small nail. A sneeze can exceed the speed of 100 mph. Beards are the fastest growing hair. If the average man never trimmed his beard, it could grow to 30 feet over the course of his lifetime. Fingers grow faster than toenails and your middle fingernail is the quickest one to grow. It takes about 150 days to grow out a full length fingernail. Your brain continues to send out electrical wave signals approximately 37 hours after death. The human nose can remember 50,000 different smells. Your jawbone is the hardest bone in your body. Your brain stops growing when your about 15 years old. Laughing and coughing put more pressure on the spine than walking or standing. Your stomach produces a new lining every 3 days in order to avoid digesting itself in its own production of acid. The spinal cord is less then two feet in length and is the same diameter as you index finger, yet it contains over 10 billion nerve cells. The eye muscle is the fastest reacting muscle of the whole body. It contracts in less than 1/100th of a second. It takes approximately 200,000 frowns to create one permanent brow line. Your eyesight is the sharpest in the middle of the day. Tell me what do you think, did you know any of these? Do you have any fun facts to share?