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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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.
There are more nerve cells in one human brain than there are stars in the Milky Way.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.