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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.