It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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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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Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.
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Your heart beats over 36 million times a year.
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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
Water striders serve as a model organism for the study of sexual conflict between males and females.
Bohr Model of Hydrogen Atom
Li-Fi Technology
Marx's Model of Historical Change
Elaboration Likelihood Model of Attitude Change
A Model of Directional Selection against a Recessive Lethal Allele