In the mid- to late-19th century, science gripped the public imagination. Literacy rates were rising, feeding demand for books. Theories, put forward in books like Charles Darwin's Origin of Species, ...

A miniature photograph of the moon, beard hairs whose owner has been dead for centuries, a shaving of Egyptian mummy bone, flowerlike patterns constructed from butterfly scales and algae called ...

Red dye fills the tiny blood vessels of this tongue tissue. The large, roundish structure in the center of image is a projection on the surface of the tongue known as a fungiform papilla. These ...