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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 shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
By definition, when a medication is administered intravenously, its bioavailability is 100%.
The longest a person has survived after a heart transplant is 24 years.
Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.