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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.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Illicit drug use costs the United States approximately $181 billion every year.
There are approximately 3 million unintended pregnancies in the United States each year.
The familiar sounds of your heart are made by the heart's valves as they open and close.