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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.