A student fills a graduated cylinder with water. They place a metal rod into the cylinder and the water level rises. They mass the ball on a scale. Using the images below, calculate the density of the rod. Be sure to use precise measurements, significant figures

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later