The human brain is made up of 80% water

Your ability to hear properly decreases when you overheat

Only humans can shed emotional tears, all other animals cry for physiological reasons

The lifespan of  a human hair is, on average, 3 to 7 years

You use up to 200 muscles every time you take a step

The nail on your middle finger is the fastest growing

The largest internal organ is the small intestine

During your lifetime, you produce enough saliva to fill two swimming pools

Over 90% of diseases are caused or complicated by stress

Women are born with a better sense of smell than men and continue to be better smellers throughout life.