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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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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The human body produces and destroys 15 million blood cells every second.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.