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Did you know?
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.
Photograph of a person with a cataract in the right eye.
Photograph illustrating the development of a fetus
Cirrhosis. Cirrhosis is characterized by a chronic deterioration of the liver, replacing healthy cel
Achondroplasia. The individual in this photograph has the reduced limb development that typifies thi
Lilly Martin Spenser’s painting, Domestic Happiness (1844), reflects the change in attitudes toward
This 1900 photograph of steel factories at night in Duquesne, near Pittsburgh, was tinted by hand. S