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There are more bacteria in your mouth than there are people in the world.
The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
![To examine a child’s ear, the pinna should be pulled back and up for children over 3 years; the pinn](https://biology-forums.com/gallery/47/medium_14755_07_10_12_3_29_39_93452079.jpeg)
![Children with Down syndrome have a small head, short, thick neck, flattened face, and a distinctive ...](https://biology-forums.com/gallery/47/medium_660365_18_01_17_1_36_58_24470192.png)