The natural abundances of elements in the human body, expressed as percent by mass, are: oxygen (o),65 percent; carbon (c), 18 percent; hydrogen (h), 10 percent; nitrogen (n), 3 percent; calcium (ca), 1.6 percent; phosphorus (p), 1.2 percent; all other elements, 1.2 percent. calculate the mass in grams of each element in the body of a 62-kg person.

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

Hope the image of the frequency formula