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Did you know?

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.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

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Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

Superior view of heart valves illustrating position, size, and shape of each valve. Superior view of heart valves illustrating position, size, and shape of each valve.
Obtaining protein sequence information with tandem MS Obtaining protein sequence information with tandem MS
A Semantic Network Diagram for the Category “Animal” A Semantic Network Diagram for the Category “Animal”
The kidney with an expanded view of the nephron. The kidney with an expanded view of the nephron.
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Right lateral view of several articulated thoracic vertebrae Right lateral view of several articulated thoracic vertebrae
Video: Structures that affect circulation - heart and MABP

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