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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.