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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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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.