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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.

