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Did you know?
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
Did you know?
Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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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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The human body produces and destroys 15 million blood cells every second.
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Thyroid conditions may make getting pregnant impossible.