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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.
The average adult has about 21 square feet of skin.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.