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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.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.