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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

Changes in Earth's atmospheric carbon dioxide levels over geological time. Changes in Earth's atmospheric carbon dioxide levels over geological time.
Temperature cycles for 24 hours Temperature cycles for 24 hours
Norepinephrine and the Sleep–Waking Cycle Norepinephrine and the Sleep–Waking Cycle
Levels of protein structure: Secondary structure Levels of protein structure: Secondary structure
Example of Tabular List organization levels and formatting. Example of Tabular List organization levels and formatting.
Hydrocarbon hormone ethylene Hydrocarbon hormone ethylene
Video: Chloroplast Structure & Light Dependent Reactions (Photosystem 1 and 2 Cyclic Electron Flow)

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