20 THINGS THEY SHOULD KNOW

ABOUT HUMAN BEINGS

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1. There are 270 bones in the human body at birth reducing to 206 by adulthood due to some bones fusing. 

2. There is approximately 4.8 to 5.5 liters (1.2 to 1.5 gals)of blood in the average human body. The human heart beats 100,000 times per day, pumping 5.5 litres per minute, which adds up to about 3 million litres of blood a year.

3. The tallest human being on record was born in the USA in 1918 and grew to a height of 8' 11" (2.72 meters).

4. The average human being has 22 square feet of skin.  The skin’s outer layer sheds every 2-4 weeks, amounting to roughly 0.7 kg of dead skin in a year.

5. There are just six different colored eyes among human beings. Irises are classified as being one of six colors: amber, blue, brown, gray, green, hazel, or red.

6. Fingernails grow at an average rate of 0.1 mm/day (1 cm every 100 days). Fingernails require 4 to 6 months to regrow completely. Toenails require 12 to 18 months. Actual growth rate is dependent upon age, season, exercise level, and hereditary factors.

7. There are over 100,000 hairs on the human body.  Blondes have an average of 150,000 hairs, the average redhead has 90,000.  Those with black or brown hair average 110,000 to 100,000 hairs. There are about 5 million hair follicles on the adult human body and men have a few hundred thousand more than women.                           

8. A baby chimpanzee is carried by the mother on her front side for 3 to 6 months. A human baby begins walking an average of between 9 and 12 months after birth.

9. Homo sapiens (Latin: "wise man") is the scientific name for the human beings.Homo is the human genus, which also includes Neanderthals and many other extinct species of hominid. We humans are the only surviving species of the genus Homo.

10. As far as science knows, there are about 7 billion human beings alive today - and they all live on Planet Earth.

11. Guinness World Records says the oldest living person verified by original proof of birth is Misao Okawa, a 115-year-old Japanese woman. The oldest verified age was 122 years and 164 days: Jeanne Calment of France, who died in 1997

12. The heaviest person in medical history was Jon Brower Minnoch (USA)(1941–83), who had suffered from obesity since childhood. He was 185 cm (6 ft 1 in) tall and weighed 442 kg (975 lbs) in September 1976.

13. The fastest human foot-speed was recorded between 60 and 80 metres by Usan Bolt in world record time of 9.58-second for the 100 metres sprint in Berlin. He was clocked at 44.64 kms per hour or 27.8mph.

14. The earlest human like creature named Taumai appeared about 7.0 million years ago.

15. There are approximately 37 trillion cells in the average human body.

16. Between 3 to 5 lbs of the human body is made up of bacteria. Between 100 million to 1 billion bacteria can grow on each tooth.

17. If all the DNA in the human body were uncoiled, it would stretch out to about 10 billion miles, which is from Earth to Pluto and back.

18. The human eye can distinguish between 2.3 and 7.5 million different colours.

19. The human brain has a memory capacity which is the equivalent of more than four terabytes on a computer hard drive.

20. Human beings are the only living things on earth that sleep on their back.