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Did you know?
Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.