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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?
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.
Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
Did you know?
Illicit drug use costs the United States approximately $181 billion every year.
Did you know?
There are 60,000 miles of blood vessels in every adult human.