Vaccines prevent between 2.5 and 4 million deaths every year.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Illicit drug use costs the United States approximately $181 billion every year.
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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Human Body Muscle Diagram
Human Ear diagram
Routes for the human colonization of the New World and Pacific islands.
Molecular tree of life
Human Communication: The Basic Course, 14th Edition
Some of the major nerves of the human nervous system