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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.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.