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9gag, Boner, and Facts: Unbelievable Fun Facts About the Human Body 1. Semen ejaculates at 27 mph, making it illegal in school zones. 2. Right before you vomit, your mouth fills with quite a bit of saliva, this normally happens like 30-45 seconds before. It does this to help pro- tect your mouth from the acids in the vomit. It's also a good indicator that you are going to vomit. So if that happens to you find the near est toilet, bush, or garbage can. 3. When a pregnant woman suffers organ damage (such as a heart attack), the fetus sends stem cells to the damaged organ to help repair it. 4. Humans are deuterostomes, meaning that the hole that became your mouth formed after the hole that became your anus. There was a point in your development where you were basically just an asshole. 5. Your heart rate slows when your face touches water, it's called the mammalian dive reflex 6. The inside of your cheek is made of the same tissue as the inside of the vagina. Yes, it may have something to do with the popularity of blowjobs 7. The average person farts enough in 24 hours to fill a standard child's balloon. 8. At the onset of high stress, your blood thick ens. This is to encourage clotting of blood in the case of a physical attack. This is often why stress contributes to heart attacks 9. The average boner uses about two table- spoons of blood to become erect, and about the same amount of blood is in a gerbil. 10. You can always see your nose but your mind just ignores it. 11. The tongue is the only muscle in the body ONLY connected at one end. 12. There's urea in the eye boogers you develop while sleeping. This basically means you pee from your eyes while you sleep. 13. There's actually a blind spot in your vision but your brain fills it in 14. Pollen is essentially plant sperm':. There fore, this makes hay fever an STD. Since no one voluntarily takes in pollen, l've concluded we're all being raped by trees. VIA 9GAG.COM Fun facts!