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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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The longest a person has survived after a heart transplant is 24 years.

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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

Deciduous and permanent teeth. (A) The deciduous teeth, with the age of eruption given in months; (B Deciduous and permanent teeth. (A) The deciduous teeth, with the age of eruption given in months; (B
Three phylogenetic representations of modern human origins. Three phylogenetic representations of modern human origins.
Abundant cave art after about 30,000 years ago is evidence of the importance of symbolic behavior fo Abundant cave art after about 30,000 years ago is evidence of the importance of symbolic behavior fo
Preschool: 3–6 years. Preschool: 3–6 years.
Prevalence of good health in Canadians aged 65 years and older Prevalence of good health in Canadians aged 65 years and older
Earth 150 Million Years Ago Earth 150 Million Years Ago
Video: Hydrogen bonds - role in the body

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