There are 60,000 miles of blood vessels in every adult human.
Did you know?
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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Illicit drug use costs the United States approximately $181 billion every year.
