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Did you know?
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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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.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.