Why is earth's surface warmer in the northern hemisphere when it is summer there

 By definition, summer is the portion of the year in which the hemisphere is tilted toward the sun, so that sunlight strikes the surface more directly. When it is summer in the northern hemisphere, it is winter in the southern hemisphere, and vice versa

Earth is warmer in northern hemisphere because of a couple of factors, such as the the tilt of the earth, and where it is at in comparison to the sun since Earth doesn't orbit a perfect circle.

The earth's tilt gives us season,and when the northern hemisphere is tilted toward the sun, it makes it summer there, and the placement of earth is close to the sun.

Now, the closer you go to the equator, the hotter you get, because the sun us always hitting the equator.

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