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There are more nerve cells in one human brain than there are stars in the Milky Way.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
Atropine, along with scopolamine and hyoscyamine, is found in the Datura stramonium plant, which gives hallucinogenic effects and is also known as locoweed.
The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.