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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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.
Blood is approximately twice as thick as water because of the cells and other components found in it.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

