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BALANCING THE NITROGEN CYCLE CHEMICAL EQUATIONS

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

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.