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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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.
Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
Cyanide works by making the human body unable to use oxygen.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.