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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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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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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.