Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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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 ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Model for cytoplasmic segregation
Eye Model
Heart Model
A two-compartment model of pharmacokinetics.
Denney's model ON actual level of performance on exercised and unexercised abilities
Molecular model of homologous recombination in meiosis