How do rivers become larger as they travel across land? Groundwater rises, adding water to rivers.
Tributaries combine, adding water to rivers.
Ice sheets melt slowly, adding water to rivers.
Rainfall in an area increases, adding water to rivers

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