Define the term mole.
Given that the molar mass of water is 18g/mol
What is the mass of 4 moles water molecules?
How many molecules are there?
How many atoms are there? (Avogadro's constant = 6.02x10

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