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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 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.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.