Sneezing clears dirt from the nose.
The study of the iris of the eye is called iridology.
Babies always have blue eyes when they are born. Melanin and exposure to ultraviolet light are needed to bring out the true color of babies' eyes. Until then they all have blue eyes.
Ophthalmic surgery was one of the most advanced areas of medicine in the ancient world. Detailed descriptions of delicate cataract surgery with sophisticated needle syringes is contained in the medical writings of Celsus (A.D. 14-37)
We are visual creatures, as almost 90% of the information we receive about our environment comes from our eyes.
A square inch of skin consists of 1300 nerve cells.
A hair grows by 0.3 to 0.5mm per day, 1 to 1.5cm per month and 12 to 15cm per year.
In an average healthy adult, the volume of blood is one-eleventh of the body weight, or between 5 and 6 quarts. (The amount of oil used in the average V8 engine)
Humans and dolphins are the only species that have sex for pleasure.
Humans have the ability to distinguish 4000 to 10000 smells.
A cluster of dead end tubules near the ovaries are the remains of what could have turned into sperm ducts.
Women are better than men at identifying smells.
There are 137 million light sensitive cells in the eye's retina and the fluid that fills the eye is changed 15 times a day.
Constipation is caused when too much water is absorbed in the large intestine and poops become dry.
The human eye is the only multifocus lens in the world which can adjust in 2 milliseconds
The average human dream lasts only 2 to 3 seconds.
According to German researchers, the risk of heart attack is higher on Monday than any other day of the week.
Diabetes is the fourth leading cause of death in the U.S., accounting for about 180000 deaths per year.
We give birth to 100 billion red cells every day.
There are about 13500000 neurones in the human spinal cord.
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