1886 – An unknown assailant threw a bomb into a crowd of police, turning a peaceful labor rally in Chicago into the Haymarket massacre, which resulted in the deaths of seven police officers and many bystanders.
Many cutaneous conditions affect the human integumentary system—the organ system covering the entire surface of the body and composed of skin, hair, nails, and related muscle and glands. This broad spectrum of conditions includes diseases (such as measles) (pictured), as well as many nonpathologic states (like, in certain circumstances, melanonychia and racquet nails). Classification of these conditions often presents many nosological challenges, since underlying etiologies and pathogenetics are often not known. While only a small number of skin diseases account for most visits to the physician, thousands of skin conditions have been described. Clinically, the diagnosis of any particular skin condition is made by gathering pertinent information regarding the presenting skin lesion(s). Diagnosis of many conditions often also requires a skin biopsy which yields histologic information that can be correlated with the clinical presentation and any laboratory data. (Full list...)
The earliest reliably dated photograph of people, taken by Louis Daguerre one spring morning in 1838 from the window of the Diorama, where he lived and worked. It bears the caption huit heures du matin (8 a.m.). Though it shows the busy Boulevard du Temple, the long exposure time (about ten or twelve minutes) meant that moving traffic cannot be seen; however, the bootblack and his customer at lower left remained still long enough to be distinctly visible. The building signage at the upper left shows that the image is laterally (left-right) reversed, as were most daguerreotypes.