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 ...

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 ...

Rotate the objective lenses so that the low-power, eg x10, is in line with the stage. Image caption, Turn the coarse focus so that the stage is as close to the objective lens as possible. You should ...