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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.
The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.