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Cyanide works by making the human body unable to use oxygen.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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.
Blood is approximately twice as thick as water because of the cells and other components found in it.