THE UNKNOWN FACTS-5

1. The cerebral cortex makes up about 77%

of the total volume of the human brain.

2. Approximately 8% of all males and about

0.5% of all females are colorblind.

3. Humans can hear sounds with frequencies

between 20 and 20,000 Hz.

4. The National Institutes of Health was

established in 1887.

5. There are approximately 1 billion neurons

in the human spinal cord.

6. In 1891, Wilhelm von Waldeyer coined the

term "neuron."

7. A giraffe has seven vertebrae in its

neck...this is the same number of neck

bones as in people and most other

mammals.

8. Venomous snakes can be dangerous even

after they are dead. People have been

"bitten" by snakes that were dead or

thought to be dead.

9. When asleep, humans spend 23.1% of the

time in rapid eye movement (REM) sleep.

10. Receptor cells in the taste buds are

replaced about once every 10 days.

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