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The familiar sounds of your heart are made by the heart's valves as they open and close.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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.
To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.