Tell me as much as you can about UV Rays without doing any additional research. Also for fun in case you need points :) I'll give Brainliest to the most detailed answer.

They need to be powered by sun and u that’s all i know

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