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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.