Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Sickled and normal red blood cells
Inferior orbital fissure
Cumulative Standard Normal Distribution
This image shows a normal third-trimester fetal brain
Two normal frequency distributions with the same mean but different amounts of variation