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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.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.