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Did you know?
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
Did you know?
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.