Which technique is used to separate helium from a mixture of helium and methane

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

Ansa leaf changing color in autumn;

Ans() ; the burning of them contributes to global warmingthey come from decayed organic material;