A rock sample composed of a compound made of iron and sulfur Has a mass of 125.67g. Analysis of the rock finds 66.98 g of fe, calculate the mass of the sulfur, calculate the percentage of Fe in the sample , what is the percentage of S in the sample

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