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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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Thyroid conditions may make getting pregnant impossible.
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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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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.