A sample of lead was cooled from 93 degrees to 29.5 degrees C. What is the temperature change of the sample? Is this an endo or exothermic process?

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

What are the choices?

Cause its being chemically applied?