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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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Thyroid conditions may make getting pregnant impossible.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.