When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Atropine, along with scopolamine and hyoscyamine, is found in the Datura stramonium plant, which gives hallucinogenic effects and is also known as locoweed.
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Green tea is able to stop the scent of garlic or onion from causing bad breath.
A trilobite fragment (T) in a thin-section of an Ordovician limestone; E=echinoderm; scale bar is 2