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The human body is an incredibly complex and intricate system, one that still baffles doctors and researchers on a regular basis despite thousands of years of medical knowledge. As a result, it shouldn’t be any surprise that even body parts and functions we deal with every day have bizarre or unexpected facts and explanations behind them. From sneezes to fingernail growth, here are 100 weird, wacky, and interesting facts about the human body.

  • 50,000 of the cells in your body will die and be replaced with new cells, all while you have been reading this sentence! pretty cool
  • Your body requires 1000-1500 calories per day just to simply survive (breathing, sleeping, eating).
  • The brain itself cannot feel pain. While the brain might be the pain center when you cut your finger or burn yourself, the brain itself does not have pain receptors and cannot feel pain.
  • The average human body contains enough: Sulphur to kill all fleas on an average dog, Carbon to make 900 pencils, Potassium to fire a toy cannon, Fat to make 7 bars of soap, Phosphorus to make 2,200 match heads, and enough Water to fill a ten gallon tank
  • Your left lung is smaller than your right lung to make room for your heart.
  • The average human produces a quart of saliva a day or 10,000 gallons in a lifetime.
  • Every day an adult body produces 300 billion new cells.
  • In one hour, your heart works hard enough to produce the equivalent energy to raise almost 1 ton of weight 1 yard off the ground.
  • Scientists say the higher your I.Q. the more you dream.
  • The largest cell in the human body is the female egg and the smallest it the male sperm.
  • You use 200 muscles to take one step.
  • You use an average of 43 muscles for a frown.You use an average of 17 muscles for a smile.
  • The average human's heart will beat 3000 million times in their lifetime. The average human will pump 48 million gallons of blood in their lifetime.
  • In 1 square inch of skin there lies 4 yards of nerve fibers, 1300 nerve cells, 100 sweat glands, 3 million cells, and 3 yards of blood vessels.
  • There are 45 miles of nerves in the skin of a human being.
  • Muscle cells live as long as you do while skin cells live less than 24 hours.
  • A fetus acquires fingerprints at the age of three months.
  • A full bladder is roughly the size of a soft ball
  • Your brain operates on the same amount of power that would light a 10-watt light bulb.
  • There are 5 million hair follicles on an average adult.
  • The acid in your stomach is strong enough to dissolve razorblades.
  • The human brain cell can hold 5 times as much information as the Encyclopedia Brittanica.
  • Approximately 75% of human poop is made of water.
  • Your eyes are always the same size from birth but your nose and ears never stop growing.
  • It takes the food seven seconds to get from your mouth to your stomach.
  • The average human dream lasts 2-3 seconds.
  • Your brain is more active during the night than the day.
  • One human hair can support 3kg.