Graphite is a soft, dark material often used as a lubricant and to make pencil lead. Diamond is often a clear, hard crystal. Which of the following best explains the difference in these materials? 1. The arrangement of the atoms of each one
2. The elements of which each one is made
3. The size and shape of the individual atoms
4. The number of atoms each one is made of

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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