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The longest a person has survived after a heart transplant is 24 years.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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.