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Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
Did you know?
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.