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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Everyone has one nostril that is larger than the other.