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Biology Facts & Trivia - Page 8

20/20 vision means the eye can see normally at 20 feet. 20/15 is better; the eye can see at 20 feet what another eye sees at 15 feet. Sciensational.com

Healthy nails grow about 2 cm each year. Fingernails grow four times as fast as toenails. Sciensational.com

Rats multiply so quickly that in 18 months, two rats could have over 1 million descendents. Sciensational.com

Ants do not sleep. Sciensational.com

Elephants have been known to remain standing after they die.

The average human produces about a litre of saliva a day -- about 37,854 litres in a lifetime Sciensational.com

A cockroach can live for several weeks without its head. Submitted by: Gads - New York, United States.

Fish are the only vertebrates that outnumber birds. Sciensational.com

Seventy percent of the dust in your home consists of shed human skin

Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body. Sciensational.com

A mosquito has 47 teeth. Sciensational.com

Shark's teeth are literally as hard as steel. Sciensational.com

Lobsters have blue blood.

The heart of giraffe is two feet long, and can weigh as much as twenty four pounds. Sciensational.com

Cheetahs can accelerate from 0 to 70km/h in 3 seconds. Sciensational.com

Crocodiles swallow stones to help them dive deeper.

A crocodile's tongue is attached to the roof of its mouth. Sciensational.com

The largest eggs in the world are laid by a shark.

The animal with the largest brain in relation to its body is the ant. Sciensational.com

A starfish can turn its stomach inside out. Sciensational.com