Every exquisite drawing by Santiago Ramón y Cajal, the founder of modern neuroscience, is marred by a curious mark. Here is the little-known story behind it. Working alone at the turn of the 20th ...

In 1665, English scientist Robert Hooke published Micrographia, a book full of drawings depicting views through what was then a novel invention: the microscope. Peering at a slice of cork through a ...

This is a pyramidal neuron, so named for the pyramid-shaped body at the center of this drawing, from the cerebral cortex of a human. This outermost layer of the brain integrates information from ...