The human eye can distinguish 10 million different colours.
A person uses 17 muscles when they smile, and 43 when they frown.
By the age of 60 most people lose half of their taste buds.
On average, a person says 4,800 words in 24 hours.
The retinas inside the eye cover about 650 square mm and contain 137 million light-sensitive cells: 130 million are for black and white vision and 7 million are for helping you see in colour.
The muscles which help your eyes to focus complete around 100,000 movements a day. In order to make your leg muscles do the same amount of movements, you would need to walk 80 kilometres.
Ingrown toenails are hereditary.
A person would die quicker from a total lack of sleep than from hunger. Death would occur after ten days without sleep, whereas from hunger it would take several weeks.
A cough amounts to an explosive charge of air which moves at speeds up to 60 miles per hour.
In the morning, a person is about 8 millimetres taller than in the evening.
If you were locked in a completely sealed room, you would not die due to a lack of air, but from carbon dioxide poisoning.
