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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.