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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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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.