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Author Question: Which research method involves manipulating a variable in order to determine how it affects another ... (Read 64 times) |
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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.