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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.
In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.
Vaccines prevent between 2.5 and 4 million deaths every year.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.