Humans have the ability to distinguish 4,000 to 10, 000 smells. 
Every hour, the human eye can process 36,000 bits of information. 
Nails and corneas are the only two tissues in the body that do not receive oxygen from blood. 
The length of the finger indicates how fast the nail grows. The nail of the middle finger grows faster than others. 
The human ears can hear in the frequency of 1,000 to 50, 000 hertz. 
The total surface area of the human brain is about 25, 000 square cms. 
Sound that is above 130 decibels can cause pain to our ears. 
There are around 100 receptors in each of our fingertips. 
The weight of skin in a human adult is 8 to 10 pounds. 
The middle part of the back is the least sensitive part of our body. 
Children have better sense of smell than adults. 
The eyelashes shed by a human in his entire life is of 30 m of length. 
After death, the body starts to dry out creating an illusion that the nails and hairs are growing even after death. 
The base of the spinal cord has a cluster of nerves, which are most sensitive. 
Platelets, which are one of the constituents of the blood are produced at the rate of one hundered billion per day. 
The sense of taste is the weakest of the five senses. 
Humans have the ability to differentiate about 10, 000 odour. 
It takes time for the newborn baby to learn to turn the pictures right side up, as it sees the world upside down in the beginning. 
If human sense of smell is affected, sense of taste is also affected as the brain interprets signals from the nose and tongue. 
There are around 1,200,000 optic fibers in the human eye. 
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