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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
Did you know?
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
Did you know?
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
![Placenta previa, longitudinal section showing the placenta growing over the opening into the cervix.](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_52_26_82602215.jpeg)
![A tracheotomy tube in place, inserted through an opening in the front of the neck and anchored withi](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_14_27_8496830.jpeg)