1. The largest cell in the human body is the female egg, which is about 100 millionths of a meter. The smallest is the male sperm, which is 50 micrometers. Just imagine! The tiniest thing a human eye can see is 0.1mm. So a microscope definitely needed for that! 2. There are 640 muscles in the human body. It takes 17 of them to smile and 46 to frown. So when people are upset, just know it takes them more effort to be upset than happy. 3. The largest human organ is the skin! Though many people don’t think the skin is an organ, it most definitely is! 4. It’s actually better for your ears to have ear wax. Ear wax protects and catches bacteria in your ears. The wax is also just dust and particles and bacteria build up. Gross, but healthy! 5. The brain is much more active at night than during the day. Why? Because, of course, your body is working when it’s shut off. The human body does a lot of healing and growing when you’re sleeping. 6. During your lifetime, you will produce enough saliva to fill two swimming pools. 7. Your nose can remember many different smells. In fact, your nose can smell 50,000+ different scents. Not only that, but your nose has a distinct smell for your house. That’s why there’s no place like home! 8. Men produce 1,500 sperm cells per second. It takes about 74 days to fully regenerate all sperm cells until they are fully mature. 9. The small intestine is about 7 meters long, and the large intestine is about 1.5 meters long. The reason why they call it the large intestine is because it wider in diameter. 10. Sneezes regularly exceed 100 mph & nerve impulses to and from the brain travel as fast as 170 miles an hour. Bless you! 11. Your eyes are always the same size from birth, but your nose and ears never stop growing. 12. Women’s hearts beat faster than men’s hearts do! 13. The brain itself cannot feel pain, the reason you feel pain is because the brain has many different nerves. http://scienceblogs.com/sciencetolife/2008/02/28/100-weird-facts-about-the-huma/
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