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Vaccines prevent between 2.5 and 4 million deaths every year.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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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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A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.