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Author Question: In the U.S. AC line voltage oscillates at a frequency of a. 50 Hz c. 120 Hz b. 60 Hz d. none of ... (Read 16 times) |
The familiar sounds of your heart are made by the heart's valves as they open and close.
The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
The average office desk has 400 times more bacteria on it than a toilet.
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.
Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.